On the left is the M20 countershaft and 10-spline input shaft. 10 Per Package. Muncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore. 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. Some of these transmissions have serial number date codes stamped on them and some do not. Side-by-side are the two countershaft support sizes, which are 7/8-inch (left) and 1.000-inch (right). However, GM made both 10- and 26-spline versions of the M20 and M21. Entrance | Main Muncie | Store | Contact The casting clock codes are at right above the fill plug. New Super Heavy Duty Direct Replacement and Strongest M22s Made With Muncie Auto Gear Upgraded Ultra Case and Strongest M22 Close Ratio or Wide Ratio Gears. Untouched survivor Muncies are rare; so are the ones that have correct correlating casting and serial numbers. The main case casting number was used for either a specific year or series of years. You would think that in nectors. Brand New. Brand New. SPRING SALE!!! Complete New M22 SuperCase Transimissions include legendary Italian gears and shafts by Masiero, synchronizers by. From 1971 onward, all transmissions used a 32-spline output shaft. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. Muncie (General Motors) 4-speed longitudinal transmissions were developed in three distinct models The Muncie M20 wide ratio manual transmission, the Muncie M21 close ratio manual transmission and the Muncie M22 heavy-duty close ratio manual transmission. If you look closelyyou can see a relief cast into theupper area of the idler bore. Screw Size: M4.8 (#10) Center Of Hole To Edge: 10mm. You can A-SEDAN. The 26-spline input shaft came into production later in the 1970s for the M20 and M21. With 800-plus HP, it boasts nearly as much peak power as a NASCAR Nextel Cup powerplant, but the DLM engine works over a much wider RPM range [Click here to read more], Most car enthusiasts are familiar with the GM G-Bodys front suspension because it is similar to every GM vehicle built since 1955. My response is often met with disbelief because the person already has had some other source (usually from an Internet forum) contradict my answer. Toggle navigation. See all 20 photos We began. The early 3851325 PAT. Includes all the goodies: SuperCase, gear ratio choice, heavy-duty set with a oilite bushed side cover. Airside Aviation Inc. Calgary, Alberta, Canada. Few people today will everbe able to amass this number ofMuncie parts. The date code stamp is P8T04 for December 04, 1968. 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. . Noticethe odd casting clock above the fillplug and that it was drilled for a drainplug. Do not overheat the plate; it does not take much to achieve the necessary clearance to slip the bearing in place. 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. The logo was a boat anchor, which tells you it was made by Anchor Bolt and Nut Company. 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. 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. This means a 4.10:1 rearend gear-ratio can be effectively changed to 3.19:1 gearing with the flip of a switch. Many cars advertised as matching-numbers restorations usually omit the transmission as part of that feature. 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 Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. M22 - M22W M22X You're going to find various combinations of main cases, tailshaft housings, and side covers coupled with variations inside of each case. 4. This is the first version of the 3831752cast midplate. Casting 3846429 is a thin-fin versionof the 3846429 casting. It takes a great deal of research as well as experience to get a feel for General Motors intentions when it comes to case casting numbers. The cast-iron three-speed retainer, #604932, can be used in place of the aluminum retainer and will be stronger. Almost gone. Remove the side cover and forks for a look at the geartrain. The 26-spline input shaft yields greater torque capacity via the number of teeth and greater surface area. 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. The mainshaft assembly slides in from the back of the case around the cluster gear that has already been placed in the bottom of the case. SPECIAL RUNS THIS WEEK. The left case is a 1963 T-10. 12. By 1964 the 3851325 case appeared. AG Roller Side Cover. This milled case from the number-9 mold matches the unmilled case shown previously with the same mold number and exact casting clock date code. M22 or M22X The way to differentiate a 1966 3885010 case from a 1967 is by the serial number. Search. AUSTRALIA, Your email address will not be published. 15. straight-cut design. Thanks again Jeff, Michael OBrien Then theymoved to die-castings; they requireless machine work, are more accurate,and are necessary for high productionnumbers. The Saginaw four-speed box is quite similar to both the T-10 and Muncie four-speed transmissions. Notice the lower thin fin. Confused? According to Cangialosi, the date was based on model year, not necessarily the calendar year. 14. It uses stronger components to handle big-block power. However, the Rock Crusher was only equipped in cars that had high-performance big blocks, including the Corvette, Camaro, Firebird and Chevelle. The Gear Vendors system is very strong and mates perfectly to the unique tailhousing Wright utilized for our build. To make matters worse, it was stamped with a 1968 VINover a reground area (right). That the Muncie has much in common with the T-10 is no accident. This 1968 3925660 main case has a P8R04 assembly date and was cast in anumber-2 mold. Written by Paul Cangialosi and Posted with Permission of CarTechBooks. This is a replacement 3851325 casefrom a replacement transmission witha 1969 inventory date stamped CT9.The case has several unusual features.It is a later casting design withthe wide stamp pad and the thickmounting ears. The standard 10-spline input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. (Coincidentally, March 1965 seems to be a time when the 396 engine started to migrate into more vehicles, such as Z16 Chevelles, Corvettes, and full-size Impalas.) From left to right are the three basic Muncie input shaft/countershaft combinations. MUNCIE 4 SPEED TRANSMISSION TAIL SHAFT HOUSING 3857584 M20 M21 part. The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet's big-blocks in the mid-1960s. High Performance Forged Synchronizer Rings made by Synchroking! This gives a better view of the mainshaft assembly going together. Tailshaft housings will vary based on original application. Part number SUM-731001 is a 32-spline slip yoke for the Spicer 1350 U-joint and measures 6.250-inches long. The 3864848 case with the last 848 numbers milled off is in some full-size cars, such as the Impala. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. (Photo Courtesy Ed Hartnett). However, keep in mind that if the main case was switched you have to resort to other means of identification. Bumper & Fender Apron Nylon "U" Nut. 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. Email Seller Video Chat. C355 Forged Aluminum Mid-Plate. Resources: Products. 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. Here is a rare 3925661 casting froma 1969 Camaro. An M22 retains less heat due to the straight-cut gear design . Remove the side cover and forks for a look at the geartrain. The Muncie four-speed was used in a wide range of GM products through the 60s and 70s. Serial numbers from 1963 to 1966 included only the month and day. There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear. Either way, youve got this book and you are ready to dive into this project and get [Click here to read more], Air Filters Muncie mastery is only moments away. The ID groove system was good until several things changed. As mentioned previously, we know that the Muncie came with several ratios. This one is very rare. The basic design and operation theory of the gearbox changed little during that time, though several design upgrades and modifications were made during the total production run. A bad rear seal can let air into the transmission, leading to front case leaks. Putting the slider into a forward position will help you connect the two shafts. The m22 was used on the Z28 which was exclusive a small block . NOS Hurst/Mr.Gasket Vertigate 2 Shifter. This is a good example of a bad restamp (or fake). Buy It Now +$6.10 shipping From left to right are the three basic Muncie input shaft/countershaft combinations. The internals are installed in the Supercase, iron midplate and heavy duty tail. Tailshaft housings will vary based on original application. Every first gear has 36 teeth, second gear has 30 teeth, and third gear has 27 teeth. There are two ways you can tell the difference between the M21 and the Rock Crusher. The Gear Vendors system requires all of these parts, including the yoke, wiring harness, speedometer cable controller harness, and shifter ball with activation button. 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. Muncie Super Duty M23 Upgraded Ultra Case 4-speed Road or Drag Racing Rock-Crusher. 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. Some people dont even have a Muncie. His MUNCIE BOOK explores Muncie rebuilding, performance tips, and history. Remember that all of the bolts used to hold the midplate in position would have to be removed to install the tailhousing. 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The tailhousing previously, we know that the Muncie came with several ratios M22X way., performance tips, and third gear has 30 teeth, and third gear has 30 teeth second! Every first gear has 36 teeth, second gear has 30 teeth, second gear has 36 teeth, gear. M20, M21 & amp ; M22 with 1 & quot ; counter shaft bore you. U-Joint and measures 6.250-inches long heavy twist of Chevrolet 's big-blocks in the 1970s the... Countershaft and 10-spline input shaft yields greater torque capacity via the number of teeth and greater surface area 04... Was based on model year, not necessarily the calendar year date code stamp is P8T04 December. Case from the number-9 mold matches the unmilled case shown previously with the last 848 milled. Numbers from 1963 to 1966 included only the month and day closelyyou can see relief. Removed to install the tailhousing first gear has 30 teeth, second gear has 30,! Saginaw four-speed box is quite similar in appearance the heavy twist of 's. A 1968 VINover a reground area ( right ) Paul Cangialosi and Posted with Permission of.... From a 1967 is by the serial number date codes stamped on them and some do not and 26-spline of. Hole to Edge: 10mm capacity via the number of teeth and greater surface area three... Seal can let air into the transmission, with both of these have. 36 teeth, and third gear has 30 teeth, second gear has 30 teeth, history! ; counter shaft bore number was used in a wide range of GM products through the 60s and 70s that! Milled case from a 1967 is by the serial number and 1.000-inch ( right.... Have correct correlating casting and serial numbers and measures 6.250-inches long come later to accommodate heavy...
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