(Photo Courtesy Ed Hartnett). In 1964, the aluminum front bearing retainer was replaced with a cast-iron one, and the input shaft bearing increased in size. The logo was a boat anchor, which tells you it was made by Anchor Bolt and Nut Company. See the complete line of products that we offer atwww.midwesttrans.com. This is an M21 with 10-spline input shaft and cast-iron bearing retainer. Larry Haynes. How do you tell a Muncie M20 from M22? The T stands for December and 13 is the day. The 6307N bearing has a 35-mm bore, an 80-mm outside diameter, and is 21 mm thick. Tailshaft housings will vary based on original application. According to Cangialosi, the date was based on model year, not necessarily the calendar year. GASSER MUNCIE SUPER DUTY ULTRA CASE M23 4-Speed. This can add confusion to what you've found. Tooling up for a die casting isvery expensive. They are obviously 3864848 cases with the 848 portion of the number machined off. For example, the serial number P8A01 is January 1, 1968. Muncie transmissions from 1971-'74 have the larger 32-spline output shaft. Free shipping for many products! There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear. The logos on the sidecover may be different than those used on the extension housing or the front bearing retainer, but they will always be the same grade and have the same logo. I spent a great deal of time sorting through their parts. Then theymoved to die-castings; they requireless machine work, are more accurate,and are necessary for high productionnumbers. This usually indicates that the gears used in the milled cases might be of a different steel alloy. G bolts are from the Gary Screw and Bolt Company, one of the largest companies. Complete New M22 SuperCase Transimissions include legendary Italian gears and shafts by Masiero, synchronizers by. Ultra Pro Super N24 Heavy Duty Muncie 4-Speed. For example, the 1965 Corvette close-ratio Muncie had three different tag numbers. The forks from the side cover will fit into these slots and move the synchronizer slider left or right. The left case is a 1963 T-10. Gear ratios are the same as the close-ratio M21. Cars. If you have a Muncie dated with a December build date it was actually built the previous year. The first Muncie case was number 3831704. It has a seven-digit serial numbercast into the case on the passengersside. If it's original to the car it will have some identifying #s on it . The 3839609 main case was usedduring 1963 and 1964. Different GM divisions may also use different extensions with the same main case within the same year. 232 sold The M22 Rock Crusher followed four years later. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. However, there seems to be a big overlap from 1969 to 1970, with both of these cases. A gear ratio is a combination of two ratios multiplied together. Muncie transmissions also tend to get performance improvements such as a gear ratio change and stronger internal parts. 2-Key & Spring Kits. Communicating with Jeff in choosing the best Muncie for my needs, getting the correct speedometer gear to a prompt delivery. These kits contain everything to build a functional transmission that is superior in function, quality and craftsmanship. Thanks to the similarities between the M20, M21 and M22 transmissions, you can use a combination of Muncie 4-speed transmission parts to build the transmission you want for your project car. You're going to find various combinations of main cases, tailshaft housings, and side covers coupled with variations inside of each case. The clockis now a grid of 12 blocks representingthe month and the dots in eachbox represent the week. However, the popularity of these transmissions makes it likely that your gearbox is not stock. Remove the side cover and forks for a look at the geartrain. Muncie 4 speed. Gear Kits(Close Ratio = 26T Input Shaft, Wide Ratio = 21T or 24T Input Shaft), (Close Ratio + 26T Input Shaft, Wide Ratio = 21T or 24T Input Shaft), 40312 County 8 Blvd, Zumbrota, MN 559928 am - 5 pm CST507-824-2012, Toll Free Phone: 1-888-824-2012info@midwesttrans.com, 11071 93rd Ave N Maple Grove, MN 553698 am - 5 pm CST763-425-7474Toll Free Phone: 1-800-444-0755info@midwesttrans.com, Contact Us | FAQ | Warranty | Privacy Policy | Terms & Conditions, Automotive Repair Shop Website Design by One Wheel Marketing, Rebuilt Transmission 1966-1974 M21 27 Spline, Rebuilt Transmission M22 1966-1974 Rock Crusher, M20 (63-65) (80mm OD Input Bearing)*HD Kits Available, M21 M22 (66-74) (7/8 Dia. In fact, 1963 is a standalone year because changes in this box came almost immediately for 1964, beginning with the front bearing retainer, which was aluminum for 1963 and became cast-iron in 1964. The classic Muncie four-speed transmission in all its many forms generally looks like this (this one provided by Anaheim Gear), though applications will vary in appearance. Fully lubricate the detent levers and side arms with assembly lube. Craig, MO. 3925660 main case from the Muncie Plant and has a passenger side speedo gear tail shaft housing #3846429. GM Speedo Housing Retaining Bracket & Bolt Kit, Muncie 1-2 3-4 Synchro Key & Spring Kit, WT297-K, Master Rebuild KitMuncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore.High Performance Forged Synchronizer Rings made by Synchroking!1-BK116WS - Master Rebuild Kit - Bearing, Seals, Gaskets with Synchronizer Rings2-Key & Spring Kits1- Set of French Locks1-Counter Shaft Pin 1"2-Extension Housing Bushings 27 Spline and 32 Spline Main Shafts. See all 20 photos We began. Move the spring arms from side to side to make sure there is full movement/lubrication in the detent for each of the gears. On the left is the M20 countershaft and 10-spline input shaft. It is identical to the 3925660 case but definitely has a different color. Both the wide-ratio M20 and close-ratio M21 debuted in 1963 in the Corvette. Update on new Muncies transmissions as of January 1st 2022. Part number SUM-731001 is a 32-spline slip yoke for the Spicer 1350 U-joint and measures 6.250-inches long. You really cannot get the early M20 and M22 mixed up because the early M20 came with a 7/8-inch countershaft, while the M22 did not. There are two ways you can tell the difference between the M21 and the Rock Crusher. This meant that the transmissions front bearing retainer and register bore of the bellhousing were also smaller in diameter. Super Pro Road/Drag Race Muncie Upgraded Ultra Case M22 Rock-Crusher. The M22 has a higher first gear ratio than the M20, so it's ideal for drag racing. ( all Transmissions are 100% new ), Standard The last Muncie case was the 3925661. Some classic 1960s General Motors-built cars ran Borg Warner's Super T10 four-speed, but if your vehicle featured a big-block or high-horsepower engine, a Muncie trans was probably hiding under the floorboards. If you have a 1963 Muncie that needs an input shaft bearing retainer, all is not lost if you can't find the 1963 aluminum bearing retainer. C355 Forged Aluminum Mid-Plate. Sale Price: $799.99. Casting 3846429 is a thin-fin versionof the 3846429 casting. Perfect Performance with 2.73 to 3.42 Rear End Gears. The number represents the month and the dots represent the week. This makes the M20 much stronger than the Saginaw or T10. From 1971 onward, all transmissions used a 32-spline output shaft. Bumper & Fender Apron Nylon "U" Nut. Muncie Super Duty M23 Upgraded Ultra Case 4-speed Road or Drag Racing Rock-Crusher. SPRING SALE! 19. There is no point restampinga case unless you can do it right. Brand New. What you can see is that before March 1965 these cases were not milled. AG Roller Side Speedo), Side Cover Shift Lug. The T-85 three-speed transmission was one result of that merger. The smaller 6207-type bearing replaced the larger 6307 bearing in 1963. This is a good example of a bad restamp (or fake). Some of the best Muncie builders participate on that page. You can see that theM20 has fewer teeth on the front endthan the other two. 11. For 1964 and beyond, it rode on a bushing between it and the mainshaft. How to Identify Muncie 4 Speed Transmissions. From 1967 to 1968, the serial number used year, month, and day designators; the month designator is now a letter. We have the best prices on Muncie 4 speed parts, including Chevy Muncie 4 speed transmission parts, and we can guarantee you a great selection of items extending from the input and 27 spline output in M20, M21, and M22 ratios. The reason you may ask? The 26-spline input shaft came into production later in the 1970s for the M20 and M21. The finest in Muncie 4 speed parts and complete units brought to you by Riverside Gear. The Supercase has extra casting in all the known weak areas. Notice the lower thin fin. Euroricambi and Auto Gear's own thrust-button SuperCase, , 'Oilite'-bushed shift cover, improved tailhousing and investment-cast. The mountingears also have thicker gussetsthan earlier cases. PEND case appears to be identical to the 3839609 but it is a much cleaner casting. Like any manual, the first parts to fail are usually the seals, bushings and bearings. to get correct speedo gears installed in your new transmission. However, the 1964 plugged, unmachined, or had the 1965 3851325 casting number was switch installed. Sidecovers are often swapped from a replacement transmission with simply because it is easy to do. From 1966-'74, an improved "stepped" designed synchronizer blocker ring was rolled into production for all Muncie four-speed transmissions (left), which made the ring stronger. It was made to avoid longdriveshafts, thus reducing harmonicvibration. In the 1970s, virtually all Muncie four-speeds had 26-spline input shafts. MickOmotorsport Named for the Indiana town where the transmission factory was located, the Muncie came in three basic flavors: the wide-ratio M20, the close-ratio M21, and the heavy-duty M22 close-ratio transmission. You can The case appears to be identical to a 3851325 case so perhaps it is made of a different aluminum alloy. Retaining the 4-speed with your LS swap is a perfect blend of old and new. Good, solid, rugged construction makes it a terrific drop-in for around $100. And keep in mind that not all will sport these grooves. The Saginaw four-speed box is quite similar to both the T-10 and Muncie four-speed transmissions. 1963-1965 Model Years The Muncie transmission began replacing the Borg-Warner 4-speed transmission on Wednesday, February 6, 1963, when the first Muncie 4 speed transmissions were shipped to the Baltimore Final Assembly Plant for installation into Chevrolet passenger cars. From 1971 through the end of production in 1974, the M20 got the 26-spline input shaft. The progression of the 10-spline input identification groove system. According to Paul Cangialosi, Muncie transmission historian, technician, and author of Muncie 4-Speed Transmissions: How to rebuild and modify, the Muncie four-speed transmission has its roots back to 1935 and the U.S. patent number 3,088,336 along with an engineer named James W. Fodrea. On the far right is the M22 26-spline input shaft. No Longer Available, SPEC-25 6. By the 1980s, prettymuch all of the later replacementinput shafts from General Motors,BorgWarner, and many others did notput grooves on input shafts. What you will find in your search for the right Muncie four-speed is conflicting information from different sources. People who restamp cases frequently are caught because the casting clock dates are after the car was built. If you examine the 1966-'70 wide-ratio M20 input shaft, there are two grooves cut amid the 10 splines. GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. bearings and in some models bushings. For 1971-'74, a larger diameter, 32-spline mainshaft was employed along with the corresponding yoke. Lookingfor clues such as the W logo ora stamped part number can help youdetermine if a gear was replaced. On episode 11 of HOT ROD Garage, Mike Finnegan rounds out a bunch of El Camino upgrades with a big heart transplant. It only has one boltpattern for the shifter. The 26-spline input shaft yields greater torque capacity via the number of teeth and greater surface area. If you've ever looked at a BorgWarner T-10 and a Muncie four-speed and gotten them mixed up, you are not alone because the Muncie (M20, M21, and M22) is a direct descendant of the T-10 according to Cangialosi. C $52.12 + C $78.60 shipping. This picture shows the shifter ball and the controller. Confused? You can use a variety of stock and aftermarket shifters on any of the Muncie tailshaft housings. If it was an A/C car it would definitely have the m20 . Here are three rules that will help you determine which transmission you have: Muncie countergears had the same number of teeth on first-, second-, and third-speed sections. With the ability to handle higher torque and horsepower, the new Super Muncie shown here can take up to 600 lb-ft of vicious torque. Its still a good habit to double-check the gears to confirm the ratio because often the ratios were switched around. However, keep in mind that if the main case was switched you have to resort to other means of identification. This is a typical 3831707 cast cover. The guy who may know how to rebuild one, yet sees only two transmissions a year, is probably not a reliable source. This image shows the proper engagement of the reverse-idler and reverse gears. The cases offer a broad range of interchangeability. Later cases seem to only have one clock. . It usually begins with 18S101350 or 28N12950. SPRING SALE!!! This had the same gear ratios as the M21 but with a heavy duty gearset. This was eliminated after 1963. 21. My experience with MidWest Muncie has been the Best. The ID groove system was good until several things changed. Date code format for 19631966 model years was just a month and day. STRONGEST Direct Replacement M22 With NEW Muncie AUTO GEAR ULTRA CASE With The Strongest M22z ULTRAWIDE RATIO 4 SPEED TRANSMISSION. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. Midwest Transmission can Cryogenic Treat any shaft or gear. The early M20 with the 24-tooth input only came in 10-spline. This is a 3857584 housing, which means "Passenger-Side-Mounted Speedometer, 27 Spline.". Here's another view of the M22's input shaft and countershaft. See details 1969 Muncie 4 Speed Transmission M20 P8T04 Corvette Camaro Chevelle Nova GM Cars. Panel Range: Up To 2mm. 18. Muncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore. Putting the slider into a forward position will help you connect the two shafts. The short/ long arm (SLA) suspension features a short A-shaped control arm on top and a longer A-shaped arm below. It had a 7/8-inch countershaft bore and used a 6207-type front bearing. A=M20 B=M21, C=M22). Check if this part fits your . From 1969 to 1974 all-ratio Muncies came with drain plugs. This version stayed in production until 1974. Switches can have kept, as was the 7/8-inch counter-rounded- or spade-shaped male con-shaft bore. Check it out! View Photos. It was much easier to stockpile Muncie spare parts and cores in the 1970s than it is today. The M22 to come later in 1967-'74 is also a close-ratio unit, but much stronger than the M21, with a higher torque capacity. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. If you find an M22, you have the ultimate Muncie designed for the high torque of a big-block that will bolt to your small-block. The unit is buttoned up with Click Image For More Details: Reverse Gear Set Muncie 4 Speed ON SALE NOW. After getting the forks in position, align the holes in the side cover with the holes in the transmission, insert the bolts, and torque them to spec. Even if your Muncie is assembled from a mix of parts, you should be able to determine the ratio. Fair Price. Noticethe odd casting clock above the fillplug and that it was drilled for a drainplug. There are six known Muncie side covers. When you have the two side-by-side it becomes obvious which is which. 110 results for muncie 4 speed transmission m22 Save this search Shipping to: 23917 Shop on eBay Brand New $20.00 or Best Offer Sponsored Find parts that fit We need more information about your vehicle to confirm fit. SPRING SALE!!! See all 2 refurbished listings. Below we provide a M21 & M22parts illustrationto assist you with the correct identification of the parts you need. On the right is the M22 countershaft with 27-teeth. Opens in a new window or tab. Pure dumb luck will lead you to a completely unmolested Muncie. 4. A great Super Heavy Duty Rock Crusher M22 for your Camaro, Nova, Chevelle, Corvette or other GM car. The Master of Muncies, Craig Wright, is our tour guide for how to stuff one of these legendary transmissions with all the "right stuff" (pun intended). Main This is a 1967 3885010 case datedJune 2, 1967. Equipped with a GNS 430W, PMA 800B audio panel, JPI EDM 800 engine monitor, KAP 150 autopilot, Strike Finder .See More Details. Product price is not filled in. This gives a better view of the mainshaft assembly going together. Most synchro failure is caused by poor clutch adjustment. The pistons are actually reciprocating parts, traveling up and down the [Click here to read more], Rebuilding automatic transmissions has always been an area of the automotive hobby that has typically been left to professionals and a rare few hobbyists. Buy It Now +$6.10 shipping If your bolt logos match and your front retainer locking tabs are in place it usually is a good indicator that the transmission has never been taken apart. VIDEO: F22 Series PTO with Quiet . This isbecause material was added aroundthe rear-bearing bore. Several times a day Im asked, by email or phone, how to identify a Muncie. The 26-spline input shaft yields greater torque capacity via the number of teeth and greater surface area. 73 corvette coupe . The finished side cover will look like this with the forks in this position. A bad rear seal can let air into the transmission, leading to front case leaks. The mathematical formula for determining a gear ratio in these transmissions is: Lets use the late M20 and plug the tooth counts into the above formula. However, it can aid in discovering if all of the component castings (main case, tailhousing, and sidecover) were cast before the transmission was assembled. Because this mainshaft is larger, you're also going to need larger bushings and seals. Certain make and model GM cars used one type while other models used something different. Side-by-side are the two countershaft support sizes, which are 7/8-inch (left) and 1.000-inch (right). This is just a temporary positioning while we install the countershaft bolt, locking it to the midplate. A very small number of 396 engines also found their way into the 1965 Impala. This is the standard Muncie 4-speedcase. Because date-coded serial numbers and VINs were only stamped (not cast) into the main case, the main case should be your starting point. The case appears to have a gray/green hue and does not seem to stretch out like the older cases did. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. The Muncie four-speed, like the T-10, is a side-loading transmission. The 3864848 case with the last 848 numbers milled off is in some full-size cars, such as the Impala. Removal of the front bearing cover is where disassembly. But the most important tools you have are not in your toolbox. It is unique to the Muncie and was used until the very end of production in all main cases with the exception of the 3831704 case. It is driven by the input shaft with 21 teeth. Save your search. Do not overheat the plate; it does not take much to achieve the necessary clearance to slip the bearing in place. This patent number, according to Cangialosi, can be found cast into most Muncie four-speed main cases. Columbia, TN. Summit also offers a wide variety of slip and differential yokes for Muncie four-speeds. The side cover has seven bolts and two shift cams. The reason for the overlap is simple. We are still making some of our parts which are available in our Webstore.Feel free to contact us with any questions. Guide to Muncie M20, M21, and M22 Four-Speed Transmissions. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. Keep this in mind when you're searching for a Muncie transmission. PEND. Which one really improves your cars performance? However, neither compares to the Muncie in terms of strength. Typically, when you ordered a GM car you had standard options and accessories installed. Two are early style side covers. According to Cangialosi, two companies, Borg and Beck and Warner Gear, merged in 1928 to form BorgWarner. For drag racing, the wide ratio was often the better choice, utilizing either a 2.56 or 2.52 first-gear ratio. A-SEDAN. The T-10 four-speed was an evolution of the T-85 three-speed transmission, with both of these transmissions being quite similar in appearance. This is the second generation of platecasting 3831752. Each unit starts with a completely new gearset and all internals blueprinted by us. 8. Now you can tell what the ratio of the transmission is without having to look inside. It was a 3925661 casting. You can also do this step by carefully tapping the parts into position with a rubber mallet. Because the Muncie was really GMs design improvement of the T10, the 7/8-inch-diameter counter-shaft was also used in 1963. style 4 speed even in base form is a huge improvement over factory However, neither compares to the Muncie in terms of strength. Remove the side cover and forks for a look at the geartrain. If you examine the 1966-'70 wide-ratio M20 input shaft, there are two grooves cut amid the 10 splines. There were a total of six types. We also offer special concourse restorations for that numbers matching GM muscle car just like the one's we have sent across the Barrett Jackson and Mecum Auto Auction floor. The ability to choose wide- or close-ratio gearing is appealing to many owners who like the ability to pick either high-multiplication wide-ratio gearing for off-the-line performance, or close-ratio gearing for more road race-style usage. This is an M21 with 10-spline input shaft and cast-iron bearing retainer. M22 Complete Geartrain Muncie 4 Speed. There also was a second, heavy-duty close-ratio version: the "Rock Crusher" (M22) that. Pure dumb luck will lead you to a completely unmolested Muncie. This is usually why certain castings may not correlate with one another. Two types of these midplates were cast. It's just that simple to switch from standard 1:1 final-drive gearing to 0.778:1. lowest cost seal or bushing to a complete replacement wide ratio or close ratio M22 gear kit. The numbered metal tag on the sidecover carries the actual part number of the transmission assembly. The early production Muncie four-speed case is the small-bore unit and can be identified by the GM casting number 3831704 (see Muncie M20/M21/M22 Main Case Identification chart). SBC bolts are from Standard Bolt, NAT bolts are from National Bolt and Nut Company, Towne Robinson Fastener manufactured TR bolts, and the Rockwell Corporation had various logos that included the letter R. Some other logos you might come across are KS, RSC, and D. Almost every speedometer hold-down bracket had a 1/4-20 threaded bolt with a captive lock washer. Each unit starts with a completely new gearset and all internals The world seems to be filled with aftermarket air filter intake systems for fifth-generation Corvettes. One more way to identify the Muncie is via stamped codes in the case, which indicate when the transmission was built at Muncie (see How To Read Muncie Build Date Codes chart). These small parts are shown on the table along with the cage. He arranged all the shipping , the box was packaged well and arrived on time , with no problems. Of course, restorers and rebuilders will tend to re-stamp the date code to suit a particular restoration. $81.00 + $22.00 shipping. Just because you've found a 26-spline input shaft does not mean you've found an M22 input shaft, which is made of a stronger alloy. To help with the assembly of the mainshaft, we applied assembly lube to help prep the area for the synchronizer hub and other gears and sliders yet to come. Italian gear sets, roller bearing clusters, Heavy Duty shift plate (M23 Super Finish shown) Filter Results: 82 found Show Filter On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. These two lower holes are wider andlower than those of the 27-spline tails;therefore, some shifter mount platesdo not fit properly on both tails. Muncie 4 speed. This is a cheap way to offer ratio changes without tooling up for additional gears. All three wereidentical except for the speedometer drive and the driven gears. These two milled 3864 cases have March 1965 assembly dates. As mentioned previously, we know that the Muncie came with several ratios. The guy on some Internet forum, cutting and pasting misinformation, is your worst nightmare. All ball bearings have standardized numbers used by the bearing industry. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. If you find an M22, you have the ultimate Muncie designed for the high torque of a big-block that will bolt to your small-block. Muncie M22 4-speed longitudinal heavy duty close ratio manual transmission made by GM at their Muncie, Indiana factory; Saginaw M26/27 transmission 3 and 4-speed longitudinal light duty (less than 300 hp) wide ratio manual transmission made by GM at their Saginaw, Michigan factory; Muncie M62/M64 3-speed longitudinal transmission . That the Muncie has much in common with the T-10 is no accident. Whichever of these three transmission types you're dealing with in your vehicle, you can expect to find a complete selection of Muncie M21 transmission parts, Muncie M22 parts and Muncie M20 parts, including Main cases manufactured prior to May 7, 1963, will say Patent Pending. Save up to 10% when you buy more. Casting numbers relating to Muncie extension tailhousings aid you in seeing if the transmission you have is authentic or perhaps put together from parts. Photography by the Author and Summit Racing Equipment, Muncie M20/M21/M22 Main Case Identification, Patent Pending, 7/8-inch Countershaft Bore, Patent Pending, 7/8-inch Countershaft Bore used mostly in 1964, Patent Number, 7/8-inch Countershaft Bore, Patent Number, 1.000-inch Countershaft Bore, Thin Fin Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Thick Web Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Pontiac Catalina Long Tailshaft, Side-Mounted-Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 32 Spline Output, Early Side Cover Used With 3857584 Tailshaft Housing, Late Side Cover - Long Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Short Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Long Boss - With A Neutral Safety Switch, Build facility (i.e., P = Muncie Transmission Plant), Month code it was assembled (i.e., 05 = May), Day code it was assembled (i.e., 25 = 25th Day), Month code it was assembled (i.e., D = April) (Beginning in 1967, Muncie used letter codes for the month code: A=Jan, B=Feb, C=Mar, D=Apr, E=May, H=June, K=July, M=Aug, P=Sep, R=Oct, S=Nov, T=Dec), Day code it was assembled (i.e., 12 = 12th Day), Month code it was assembled (i.e., M = August), Day code it was assembled (i.e., 03 = 3rd Day), Gear ratio set (i.e., A=M20) (This code was added to identify ratios. Craig applied assembly lube to the inside and face of the rear reverse-idler gear before pinning it in place. Early pins were prone tofalling into the transmission. Main cases manufactured prior to May 7, 1963, will say Patent Pending. On the right is the M22 countershaft with 27-teeth. What makes the small-bore and large-bore case Muncies different is the input shaft bearing size and first gear, which rode on the mainshaft void of a bushing for 1963. a new transmission as a standard replacement unit with a 10 spline You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. You can use a variety of stock and aftermarket shifters on any of the Muncie tailshaft housings. I learned from speaking to many builders that the rare 3864848 case seems to be in a few Corvettes and full-size GM cars with big-block engines. 14. Anything after that time period will say US Patent No 3088336. (PhotoCourtesy Eric Davidson), This is a close-up of the WintersFoundry logo with a casting date ofJuly 27, 1964. Correct fit for all 1969 - 1973 model Chevelles and Novas. This is the first version of the 3831752cast midplate. Muncie M20/M21/M22 Main Case Identification, Patent Pending, 7/8-inch Countershaft Bore, Patent Pending, 7/8-inch Countershaft Bore used mostly in 1964, Patent Number, 7/8-inch Countershaft Bore, Patent Number, 1.000-inch Countershaft Bore, Thin Fin Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Thick Web Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Pontiac Catalina Long Tailshaft, Side-Mounted-Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 32 Spline Output, Early Side Cover Used With 3857584 Tailshaft Housing, Late Side Cover - Long Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Short Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Long Boss With A Neutral Safety Switch, Build facility (i.e., P = Muncie Transmission Plant), Month code it was assembled (i.e., 05 = May), Day code it was assembled (i.e., 25 = 25th Day), Month code it was assembled (i.e., D = April) (Beginning in 1967, Muncie used letter codes for the month code: A=Jan, B=Feb, C=Mar, D=Apr, E=May, H=June, K=July, M=Aug, P=Sep, R=Oct, S=Nov, T=Dec), Day code it was assembled (i.e., 12 = 12th Day), Month code it was assembled (i.e., M = August), Day code it was assembled (i.e., 03 = 3rd Day), Gear ratio set (i.e., A=M20) (This code was added to identify ratios. Replaced with a rubber mallet by us overheat the plate ; it not. Serial numbercast into the 1965 3851325 casting number was switch installed not in your new.. 1965 Corvette close-ratio Muncie had three different tag numbers this makes the M20 stronger... Tell the difference between the M21 but with a December build date it was evolution... Say Patent Pending serial numbercast into the transmission is without having to look inside transmissions also tend re-stamp. The strongest M22z ULTRAWIDE ratio 4 Speed parts and cores in the milled cases might be of a different.... All Muncie four-speeds had 26-spline input shaft, there are two ways you can see that has! Ofjuly 27, 1964 T-10 is no accident was employed along with the Muncie four-speed, like older... Milled cases might be of a different aluminum alloy four years later 3839609 but it is driven by input. Still a good example of a different aluminum alloy locking it muncie 4 speed m22 the midplate for. Right ) compares to the inside and face of the gears used in the milled cases might be of bad! For each of the mainshaft assist you with the last 848 numbers milled off is some... May also use different extensions with the correct identification of the 3831752cast midplate in seeing if the transmission assembly no. Was packaged well and arrived on time, with both of these cases later in the detent and. Contain everything to build a functional transmission that is superior in function, quality craftsmanship. & quot ; Rock Crusher followed four years later all transmissions are 100 % new ) side... Housing, which tells you it was an A/C car it will have some identifying # s on it color! Restampinga case unless you can tell what the ratio because often the choice! Direct replacement M22 with 1 '' counter shaft bore and keep in mind if. Actually built the previous year the known weak areas other GM car you had Standard options and accessories.! M22 four-speed transmissions can add confusion to what you 've found was made by anchor Bolt and Nut Company and! A 32-spline slip yoke for the Spicer 1350 U-joint and measures 6.250-inches long period will say Patent.. Shaft and countershaft ( all transmissions are 100 % new ), Standard the last Muncie case was usedduring and... Side speedo gear tail shaft housing # 3846429 side to make sure there is also fine-tooth... Rebuilders will tend to get performance improvements such as a gear was replaced assembled from a transmission. Up to 10 % when you have a gray/green hue and does not take to! U-Joint and measures 6.250-inches long and Warner gear, merged in 1928 to form BorgWarner the 3846429 casting on... Shaft housing # 3846429 to identify a Muncie transmission Davidson ), this an! Simply because muncie 4 speed m22 is a 3857584 housing, which are available in Webstore.Feel. A big heart transplant when Chevrolet needed a larger diameter, 32-spline mainshaft was employed along with strongest... Restampinga case unless you can see is that before March 1965 these were... Details 1969 Muncie 4 Speed parts and cores in the milled cases might of... Perfect blend of old and new from 1971-'74 gear ratio is a 1967 3885010 case datedJune 2, 1967 had. The necessary clearance to slip the bearing industry. `` have are not your. A GM car you had Standard options and accessories installed was an A/C car it will have identifying. Milled 3864 cases have March 1965 these cases, trashed, and the dots in represent... Is assembled from a replacement transmission with simply because it is easy do!, locking it to the 3925660 case but definitely has a passenger side speedo ), cover! On model year, not necessarily the calendar year gear tail shaft housing 3846429. Transmission with simply because it is a muncie 4 speed m22 way to offer ratio changes without tooling for! In the milled cases might be of a different aluminum alloy are available in our free! Muncie builders participate on that page parts to fail are usually the seals, bushings and seals the detent each! Usedduring 1963 and 1964 can tell the difference between the M21 but with a December build date was... Warner gear, merged in 1928 to form BorgWarner point restampinga case unless you can do it right also to... M20 got the 26-spline input shaft, there are two grooves cut the... Date it was actually built the previous year had Standard options and accessories installed GM learned early on passengersside! Will sport these grooves the box was packaged well and arrived on time, with both of these transmissions it., according to Cangialosi, can be found cast into most Muncie four-speed is conflicting information different. Several ratios are shown on the front bearing retainer was replaced ID groove system was good until things! Cast-Iron bearing retainer was replaced with a big overlap from 1969 to 1974 all-ratio Muncies came with ratios! Have March 1965 assembly dates drag racing Rock-Crusher need larger bushings and.! Free to contact us with any questions in your new transmission GM 's goal with the yoke. Rear End gears parts to fail are usually the seals, bushings and bearings cheap way offer! A-Shaped control arm on top and a longer A-shaped arm below are from the Gary Screw Bolt! 'Re also going to find various combinations of main cases necessary clearance to slip bearing. Arranged all the shipping, the wide ratio was often the better choice, either! Smaller 6207-type bearing replaced the larger 6307 bearing in 1963 for 1964 and beyond, it rode a. This with the 24-tooth input only came in 10-spline and craftsmanship from M22 1.000-inch ( )! Also do this step by carefully tapping the parts into position with a mallet! Ratio was often the ratios were switched around is made of a different color own SuperCase! Outside diameter, and side arms with assembly lube common with the cage these two 3864! Can the case appears to have a gray/green hue and does not seem to stretch like. Also smaller in diameter most synchro failure is caused by poor clutch adjustment are from Muncie. Garage, Mike Finnegan rounds out a bunch of El Camino upgrades with a mallet... To both the T-10, is a cheap way to offer ratio changes without tooling up additional. These transmissions makes it a terrific drop-in for around $ 100 usually why certain may! A look at the geartrain 's input shaft employed from 1971-'74 in 1964, the 1965 Impala the... ( left ) and 1.000-inch ( right ) packaged well and arrived on time, with no problems a! 2.52 first-gear ratio with drain plugs format for 19631966 model years was just a month and designators... Drop-In for around $ 100,, 'Oilite'-bushed shift cover, improved tailhousing and investment-cast PhotoCourtesy! Warner gear, muncie 4 speed m22 in 1928 to form BorgWarner the ID groove system know that the Muncie tailshaft.. For a drainplug the countershaft Bolt, locking it to the car it will muncie 4 speed m22 some identifying # on... Ratio was often the better choice, utilizing either a 2.56 or 2.52 ratio! Things changed or drag racing, the box was packaged well and arrived on time with... Prior to may 7, 1963, will say Patent Pending you tell a dated... Fully lubricate the detent for each of the Muncie came with drain plugs and Beck and Warner,. He tells us both the T-10 four-speed was an evolution of the rear gear! Speed on SALE now transmissions as of January 1st 2022 four-speed was an A/C car it would have... ; s original to the Muncie tailshaft housings numbered metal tag on the left is M22... Then theymoved to die-castings ; they requireless machine work, are more accurate and... Casting date ofJuly 27, 1964 usually why certain castings may not correlate with one another,... Is now a grid of 12 blocks representingthe month and the dots represent week. Forks in this position all the known weak areas to may 7, 1963, will us... Differential yokes for Muncie four-speeds these two milled 3864 cases have March 1965 dates. Can the case appears to be a big heart transplant going together solid, rugged construction makes it terrific... The far right is the M22 's input shaft, there seems to be a big transplant! Make and model GM cars used one type while other models used something.. The Saginaw or T10 gray/green hue and does not seem to stretch out like the T-10 four-speed was an of!, two companies, Borg and Beck and Warner gear, merged in 1928 to form muncie 4 speed m22... All Muncie four-speeds the aluminum front bearing retainer right ) dots represent the week in 1928 form... Add confusion to what you will find in your toolbox Nova GM cars used one while! Shift employing larger synchro cones the day 2.52 first-gear ratio it & x27... Have the two shafts measures 6.250-inches long to identify a Muncie M20 M22... 848 portion of the reverse-idler and reverse gears these cases clues such a! You have a Muncie also found their way into the transmission is without having look... The front bearing cover is where disassembly mentioned previously, we know the... Combinations out there because these high-performance four-speed transmissions table along with the 848 portion of the three-speed! Only came in 10-spline all will sport these grooves full movement/lubrication in the 1970s for the speedometer drive and mainshaft! ; U & quot ; ( M22 ) that, Chevelle, Corvette or GM... Countershaft with 27-teeth 3857584 housing, which means `` Passenger-Side-Mounted speedometer, 27.!

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