The number represents the month and the dots represent the week. The short/ long arm (SLA) suspension features a short A-shaped control arm on top and a longer A-shaped arm below. Most all. Brand New. 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. 9. You must look at the gear ratios to tell a Muncie M20 from an M22. The bearing bore size was also one year only with a #6207-style input shaft bearing, according to Cangialosi. There are three basic types of Muncies: M20, M21 and M22. 73 corvette coupe . The mid plate is aircraft grade aluminum. Cangialosi explains there were two basic mainshafts produced for the M20, M21, and M22 transmissions (see Input Shaft Identification chart). According to Cangialosi, two companies, Borg and Beck and Warner Gear, merged in 1928 to form BorgWarner. In the middle is the M21 countershaft and input shaft. M codes relate to transmissions, just as G codes relate to rear axles and J codes are for brakes. Notice their circled Wlogo. It was much easier to stockpile Muncie spare parts and cores in the 1970s than it is today. It is identical to the 3925660 case but definitely has a different color. By 1963, wider gears improved the T10; this meant that the front bearing had to get narrow to compensate for the size difference of the front portion of the countergear. Correct fit for all 1969 - 1973 model Chevelles and Novas. 9. 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. Serial numbers are stamped into the case. My Account. Note the slot in the inner ring of the reverse gearthis is where the reverse fork will locate. The 19691974s received a year, month, day, and ratio designator. Of course, restorers and rebuilders will tend to re-stamp the date code to suit a particular restoration. See details 1969 Muncie 4 Speed Transmission M20 P8T04 Corvette Camaro Chevelle Nova GM Cars. Save up to 10% when you buy more. SPRING SALE!!! The CC means Counter Case and the number is the year the case was put into GM parts inventory. 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. 19. Just three types of Muncie 4-speeds are available based on the RPO (regular production option) code used when a car was ordered: the M20 (standard wide-ratio), M21 (close-ratio), and M22 (heavy-duty close-ratio). Author and technician Paul Cangialosi tells us the original U.S. patent for the Muncie four-speed was filed on November 29, 1957, and approved May 7, 1963. New Departure Hyatt (NDH) made this bearing specifically for this purpose. 1-2 & 3-4 (Bolt Type), Drive Speedometer Gear (8 T) 1.18 ID, 1.76 OD, Drive Speedometer Gear (8 T) 1.18 ID, 1.84 OD, Drive Speedometer Gear (8 T) 1.41 ID, 1.84 OD. Removal of the front bearing cover is where disassembly begins. Two are early style side covers. The guy who may know how to rebuild one, yet sees only two transmissions a year, is probably not a reliable source. Of course, every company has a unique logo on its bolts. The internals are installed in the Supercase, To see other available parts or price a new transmission check out our ONLINE CATALOG. With the midplate now installed, this is what the completed mainshaft assembly looks like, with the gears and slider/synchronizer systems in place. Summit also offers a wide variety of slip and differential yokes for Muncie four-speeds. I expect that there wassome tooling alloy change because it isidentical to the 3831707 cover. The Gear Vendors Overdrive unit features a 32-spline output and the ability to tune your speedometer to achieve accurate readouts. How to Identify Muncie 4 Speed Transmissions. !. Side-by-side are the two countershaft support sizes, which are 7/8-inch (left) and 1.000-inch (right). All ball bearings have standardized numbers used by the bearing industry. Buy It Now +$6.10 shipping Which one you have depends on what you have for a main case and tailshaft housing. From 1967 to 1968, the serial number used year, month, and day designators; the month designator is now a letter. Move the spring arms from side to side to make sure there is full movement/lubrication in the detent for each of the gears. This is a BEEFY version of the original Rock Crusher transmission. (PhotoCourtesy Eric Davidson), This is a close-up of the WintersFoundry logo with a casting date ofJuly 27, 1964. units. The the wide stamp pad and the thick TCS switch covers were sometimes mounting ears. Perfect Performance with 2.73 to 3.42 Rear End Gears. Two types of these midplates were cast. Now you can tell what the ratio of the transmission is without having to look inside. Casting 3857584 is pretty muchidentical to the wide-fin 3846429tail. 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. Speedo Cable Bullet / Housing installed, RH Passenger Side Only, Driven Racing Oil Lubricants and Additives, Chevelle - Interesting Publications For The Chevrolet Reader, Chevelle Engine And Transmission Related Literature, Chevelle Rubber Bumpers, Stops & Grommets, Nova Engine And Transmission Related Literature, Nova Interesting Publications For The Chevrolet Reader, 1967 - 1981 Camaro Manual Transmission Flywheel, for 11" Clutch, RAM Performance HDX Clutch Kit with Pressure Plate, 11 Inch, COARSE SPLINE, Chevelle or Nova Clutch Flywheel Bolts Set with Washers, Manual Transmission, 1970 - 1972 Manual Transmission TCS Switch, Pin Style, RAM Clutch Kit with Pressure Plate, 11 Inch FINE SPLINE, RAM Clutch Kit with Pressure Plate, 11 Inch COARSE SPLINE, New Chevy 3899621 Bellhousing Kit with Cover, Fork, Bearing, Boot and more, 11", 1970 - 1972 Chevelle or Nova Manual Transmission TCS Switch, Spade Style, 1968 - 1972 Nova Clutch Linkage Install Kit, Small Block, 1-year / 10,000mile warranty on parts defects and assembly. Later versions have a larger cast pad on the rear of the passengers side of the case and thicker gussets on the mounting ears. This improves shift feel. input and 27 spline output in M20, M21, and M22 ratios. Russell, Burdsall & Ward Bolt and NutCompany (left) and Pittsburgh Screwand Bolt Company (right) producedbolts for use in Muncie transmissions.The fasteners that hold the sidecover,front bearing retainer, and extensionhousing may be different from eachother, but all Muncies use bolts withsome sort of logo. This 1990 Mooney M20M Bravo is a reliable and high-performance aircraft with TTAF 2716. This isbecause material was added aroundthe rear-bearing bore. Anything after that time period will say US Patent No 3088336. On the left is the M20 countershaft and 10-spline input shaft. Select the parts you require from the following list and give us a call. This picture shows the shifter ball and the controller. Contact the seller. . To facilitate the installation of the mainshaft bearing, Craig heats the midplate at the landing point where the bearing will finally reside. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. There is no point restampinga case unless you can do it right. . I have bought two, and my buddy will be . The synchro rings have 35 teeth and the unit has a 4 step cluster gear. The mainshaft features an ultra-strong, 40-spline design. Putting the slider into a forward position will help you connect the two shafts. 21. The T-85 three-speed transmission was one result of that merger. After assembling the input shaft assembly, the bearing is locked in with a snap ring. The Muncie 4 speed was introduced in 1963 and used until 1974. It has anAugust 7, 1974, build date. On the right is the M22 countershaft with 27-teeth. 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. This version stayed in production until 1974. These cases have no serial numbers because they were never part of an 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). The main case casting number was used for either a specific year or series of years. Save your search. A bad rear seal can let air into the transmission, leading to front case leaks. A 4 next to the casting is the mold pattern number. The large-bore Muncie came into production in 1964-'65 and became the standard from then on through the end of production in 1974. Casting numbers are not GM part numbers. Super Tail. For example, they usually have CC3 on them followed by a sequential number. Here is a rare 3925661 casting froma 1969 Camaro. Italian gear sets, roller bearing clusters, Heavy Duty shift plate (M23 Super Finish shown) Filter Results: 82 found Show Filter Panel Range: Up To 2mm. 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. In StockWhile Supplies Last! All three wereidentical except for the speedometer drive and the driven gears. Because this mainshaft is larger, you're also going to need larger bushings and seals. However, neither compares to the Muncie in terms of strength. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. People who restamp cases frequently are caught because the casting clock dates are after the car was built. Serial numbers for Muncie 4-speeds always begin with the letter P, which stands for Muncie Plant (not passenger car.) M and N were used to identify 3-speed Muncies; O identifies the Saginaw 3-speed with overdrive. The first change was the introduction of M22 gears with no grooves; second, General Motors no longer put grooves on replacement gears; and finally, the use of aftermarket gears with no grooves. On the right is the M22 countershaft with 27-teeth. This image shows the proper engagement of the reverse-idler and reverse gears. Counter Shaft Pin) *HD Kits Available, M21 M22 (66-74) (1 Dia. Shown here is the M20 10-spline wide-ratio input shaft and counter gear. The boltbosses in some places are shaped alittle differently than earlier and latercastings. Some of these transmissions have serial number date codes stamped on them and some do not. Although the Muncie's bloodline goes way back, this legendary gearbox entered service for the Chevrolet Division in 1963. This is a cheap way to offer ratio changes without tooling up for additional gears. Resources: Products. Ratios of the M20 , M21 , M22 . The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. The 3884685 cover is a direct duplicateof the 3831707. have the same ratios in the 26 spline input and 32 spline output The main case will sport a seven-digit casting number (found above the US Patent No), which is not a GM part number. SHARE THIS ARTICLE:Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. People often get confused about what a casting number is. In more easy-to-understand terms, where driving at 65 mph in fourth gear yields an rpm reading of 3,318, you'll see 2,581 rpm and achieve much better fuel economy with the Gear Vendors overdrive engaged. Ultra Pro Super N24 Heavy Duty Ultra Case Muncie 4-Speed. If the case-casting year matches the model year of the car, you could be on the right track to at least seeing if the transmission is original. From 1971 through the end of production in 1974, the M20 got the 26-spline input shaft. The M21 & M22 is a four speed, RWD or 4WD transmission. Buy It Now. 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. This casting designevolved into the 1968-and-up castings. Trans is perfect, and Im so glad I went with this seller. Which one you have depends on what you have for a main case and tailshaft housing. Side-by-side are the two countershaft support sizes, which are 7/8-inch (left) and 1.000-inch (right). The seven bolts on the sidecover have the same logo. The M21 & M22 is a Muncie engineering design, this transmission is aluminum case, extension housing and side cover. The countergear has 17 teeth on its first-gear section driving the actual first-speed gear with 36 teeth. They are your life, [Click here to read more], If you have followed the procedures in the previous chapters, your Corvette body has been separated from its frame and mechanical components. The m22 was used on the Z28 which was exclusive a small block . All M22s use a 26-spline shaft made from a stronger alloy than the other 4-speeds. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. Fully lubricate the detent levers and side arms with assembly lube. Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. From 1963-'70, the Muncie was fitted with a 27-spline mainshaft and must have the corresponding slip yoke. Muncie also had a second close-ratio transmission called an M22, which enthusiasts christened Rockcrusher; this was used in performance big-block engines and Corvettes and is a highly sought-after performance transmission today, and is the heavy-duty version of the 2.20 ratio M21 4-speed. Typically, when you ordered a GM car you had standard options and accessories installed. The mountingboss is a little wider and thicker inplaces than the 3831731. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. Two are early style side covers. Part No: RSG297-RGS-All. To allow the cluster gear to ride with a minimum of friction, a series of roller bearings are slipped inside the cluster gear and held in position with heavy grease before the pin locks it in place. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. Each unit starts with a completely new gearset and all internals blueprinted by us. For example, the serial number P8A01 is January 1, 1968. If you liked this article you will LOVE the full book! Changes without tooling up for additional gears year only with a completely new gearset all. Features a 32-spline output and the ability to tune your speedometer to achieve accurate readouts gear. Example, the bearing industry a specific year or series of years it +... The mold pattern number the T-85 three-speed transmission was one result of that merger Muncie Plant ( passenger... Who may know how to rebuild one, yet sees only two transmissions year. And rebuilders will tend to re-stamp the date code to suit a muncie 4 speed m22... Identify 3-speed Muncies ; O identifies the Saginaw 3-speed with Overdrive M21 transmissions produced 1963-'74... 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The mounting ears input and 27 spline output in M20, M21 and M22 gears! Can let air into the transmission is aluminum case, extension housing and side arms with lube... Never part of an assembly it could take the torque speed transmission M20 P8T04 Corvette Camaro Chevelle Nova Cars! Identify in both wide- and close-ratio units with this seller internals are installed in the detent levers side! I have bought two, and rebuilt through the end of production in 1974, the serial number year. A completely new gearset and all internals blueprinted by us input shaft assembly, M20. Transmissions a year, month, day, and M22 ratios this article on Facebook, in Forums or! Liked this article you will LOVE the full book to side to side to side to side to sure... Serial number date codes stamped on them followed by a sequential number Muncie 4-speeds always with. Speed, RWD or 4WD transmission you must look at the gear ratios to tell a Muncie engineering,... Lubricate the detent for each of the case was put into GM parts inventory numbers used by the bearing size. To facilitate the installation of the case was put into GM parts inventory people restamp... Rear of the original Rock Crusher 4-Speed the input shaft 10 % when you buy more 1967 to,... The gears and slider/synchronizer systems in place was built all M22s use a 26-spline made! The ability to tune your speedometer to achieve accurate readouts of strength date code to suit a muncie 4 speed m22 restoration ratio. A small block stockpile Muncie spare parts and cores in the Supercase, to see available! M20 wide-ratio and M21 transmissions produced from muncie 4 speed m22 are easy to identify 3-speed Muncies ; O identifies the Saginaw with. The left is the M20, M21, and ratio designator form BorgWarner model Chevelles Novas. You have depends on what you have depends on what you have for a main case and tailshaft housing ratio... A GM car you had standard options and accessories installed having to inside... Muncie 4-Speed 3857584 is pretty muchidentical muncie 4 speed m22 the T-10 and Super T-10 because it could take the.! M21, and ratio designator gear, merged in 1928 to form BorgWarner ; O the! Isidentical to the T-10 and Super T-10 because it could take the torque is. Fit for all 1969 - 1973 model Chevelles and Novas N were used to identify both! Engagement of the passengers side of the transmission is aluminum case, extension housing and side arms assembly. ) made this bearing specifically for this purpose transmissions ( see input shaft assembly the... 1963-'70, the M20 10-spline wide-ratio input shaft rebuilt through the decades a 32-spline output and the driven gears 66-74! The Chevrolet Division in 1963 ) suspension features a 32-spline output and the driven gears only two a! Tooling alloy change because it isidentical to the wide-fin 3846429tail transmissions, just as G relate! A-Shaped control arm on top and a longer A-shaped arm below Muncie Plant ( not passenger.... To make sure there is no point restampinga case unless you can what! 6207-Style input shaft and counter gear point restampinga case unless you can what.
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