SPRING SALE!!! He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. 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. M22 or M22X The T10 front bearing size was reduced in diameter in 1963 only. Brand New SUPERCASE M22 4-Speed Muncie Rockcrusher Style Transmission, Style Transmission. Use Lubriplate 105 on the synchronizer slots. The finished side cover will look like this with the forks in this position. When you have the two side-by-side it becomes obvious which is which. These small parts are shown on the table along with the cage. 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. On episode 11 of HOT ROD Garage, Mike Finnegan rounds out a bunch of El Camino upgrades with a big heart transplant. The A stands for M20. 2-Key & Spring Kits. Muncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore. 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 large-bore Muncie came into production in 1964-'65 and became the standard from then on through the end of production in 1974. [Click here to read more], Unless you are MacGyver, it takes more than a hammer and some duct tape to build an engine. Most transmissions are missing these tags, but if you want to do a complete restoration they are generally necessary. 7. CALL JEFF (262)893-9812 for details. The 1965 versions of this case are identical except that the upper middle extension housing bolt boss on the rear of the 1965 is square rather than round (shown) on the painted orange case. From 1963-'70, the Muncie was fitted with a 27-spline mainshaft and must have the corresponding slip yoke. The T stands for December and 13 is the day. The m22 was gone in the Camaro in 72 as you state . On the left is the M20 countershaft and 10-spline input shaft. Your email address will not be published. Brand New. These are easy to adapt to a wide range of hot rods. On the far right is the M22 26-spline input shaft. The Muncie four-speed, like the T-10, is a side-loading transmission. 1-Counter Shaft Pin 1" Trans is perfect, and Im so glad I went with this seller. But the most important tools you have are not in your toolbox. According to Cangialosi, two companies, Borg and Beck and Warner Gear, merged in 1928 to form BorgWarner. Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. The seven bolts on the sidecover have the same logo. These kits contain everything to build a functional transmission that is superior in function, quality and craftsmanship. The guy on some Internet forum, cutting and pasting misinformation, is your worst nightmare. And keep in mind that not all will sport these grooves. The Muncie four-speed, like the T-10, is a side-loading transmission. Glean the basics and use them in your research. Muncie 4 speed. Brand New. For example, the serial number P8A01 is January 1, 1968. NOS Gm flywheel 14088646 86-92 Camaro, Firebird and 86-91 Corvette. Update on new Muncies transmissions as of January 1st 2022. The number represents the month and the dots represent the week. To make matters worse, it was stamped with a 1968 VINover a reground area (right). 13. Opens in a new window or tab. (Photo Courtesy Eric Davidson), his casting number is followed by anAA marker after the serial number,but I have not determined what thatmarker meant. 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. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. Muncie M22 4 Speed Transmission Gear Set 2.20 Ratio 10 Spline - 71948 Brand New $398.00 superior.auto.parts (15,595) 99.3% Buy It Now Free shipping 417 sold Sponsored GM Muncie M20 4 Speed Cluster Shaft Gear 25-22-19-17 1" Pin 2.52 Ratio - 74299 Brand New $121.00 superior.auto.parts (15,595) 99.3% Buy It Now Free shipping 315 sold Sponsored Before you here are the basics of Muncie M20, M21, and M22 four-speed transmissions. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. Move the spring arms from side to side to make sure there is full movement/lubrication in the detent for each of the gears. The 19691974 Muncies received a ratio designator at the end of the serial number: A for M20, B for M21, C for M22. 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). It is driven by the input shaft with 21 teeth. . 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. Because main cases are often swapped rather than being repaired, the best way to determine if you have an M20, M21, or M22 is to simply look at the gears. From left to right are the three basic Muncie input shaft/countershaft combinations. Columbia, TN. The case appears to be identical to a 3851325 case so perhaps it is made of a different aluminum alloy. M codes relate to transmissions, just as G codes relate to rear axles and J codes are for brakes. OD WT297-62, GM Speedo Housing Retaining Bracket and Bolt Kit, T5-TAB, Input Bearing Output Bearing Max load, M6308N, Muncie 4 Speed Transmission Master Rebuild Kit - Max Load, BK116WS-MASTER, Muncie Drive Speedometer Gear 8 Tooth, 3978758, Muncie Extension Housing 27 Spline Main Shaft, 18-410-021, Muncie Front Bearing Upgrade Kit M6307NR, 18-410-025, Muncie Input Shaft 24T 10 Spline Wide Ratio, AWT297-16A, Muncie Input Shaft 26T 10 Spline Close Ratio AWT297-16. Casting numbers are not GM part numbers. Having issues diagnosing problems with your M21 M22 4 Speed Muncie Manual Transmission? Most of thesecastings look very rough. The cheapest offer starts at $ 3,500. 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. Here is a procedure I use that works by using components as building blocks toward identification. This is the M21 10-spline input shaft with a single groove and the applicable 27/22/19/17-tooth countershaft. Good, solid, rugged construction makes it a terrific drop-in for around $100. If you arerebuilding your Muncie and you donot have this type of cover pin, put iton your shopping list. Custom built to protect the trans. I expect that there wassome tooling alloy change because it isidentical to the 3831707 cover. Casting numbers relating to Muncie extension tailhousings aid you in seeing if the transmission you have is authentic or perhaps put together from parts. Like any manual, the first parts to fail are usually the seals, bushings and bearings. P7 (1967model year) was stamped on a 19681969 3925660 case. $800. Sidecovers are often swapped from a replacement transmission with simply because it is easy to do. Chevy Muscle Car Tech Tips, Guides, Articles & How-To. After making certain that all surfaces are clean with no residue, the new gasket will be coated with Gasgacinch, and the side cover installed. Pure dumb luck will lead you to a completely unmolested Muncie. The rear pad (where thenumbers are stamped) is wider thanearlier versions of the case. The 6307N bearing has a 35-mm bore, an 80-mm outside diameter, and is 21 mm thick. The logo was a boat anchor, which tells you it was made by Anchor Bolt and Nut Company. 20. Window and tanksticker resources reveal that therewas never an M21 option printed on asticker before 1966, even though manyM21s existed I believe the final-driveratio determined whether a close- orwide-ratio transmission was installed. This is a 1967 3885010 case datedJune 2, 1967. Serial numbers are stamped into the case. Reproductionvehicle assembly manuals are a good source for correct transmission assemblypart numbers. The VIN in the left picture is 28G107211; it decodes as Pontiac(2) year 1968 (8) and G (plant) followed by the sequential production number.The G code is GMs Framingham, Massachusetts, plant that produced Chevellesand the Pontiac LeMans. This is a cheap way to offer ratio changes without tooling up for additional gears. The Summit Performance 4-Speed shifter (PN SUM-700040) is a bolt-on swap designed to fit your Muncie. The M21 & M22 is a four speed, RWD or 4WD transmission. The VIN is usually a low number because it was actually going into an early 1968 car. A gear ratio is a combination of two ratios multiplied together. Lead time 4-6 weeks. This case casting was used duringthe 1966 and 1967 model years; 1967was the first time a year designator wasadded to the serial number. 2. A=M20 B=M21, C=M22). The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963-1974. Feel free to upload pictures and ask questions. His BOOK on building and modifying manual transmissions is an Amazon best seller. Examine the input and output shafts to see if you've found the box you want. Check if this part fits your vehicle. Replaces Toyota & Lexus: 53879-17020 Lexus GS, IS, LS & SC and Toyota Celica 2000 -. My experience with MidWest Muncie has been the Best. These cases have no serial numbers because they were never part of an assembly. Year Make Model Trim Engine Add vehicle Muncie M-22 Rock Crusher Four Speed Transmission - RARE Drivers Side Speedo Refurbished Putting the slider into a forward position will help you connect the two shafts. The T-85 three-speed transmission was one result of that merger. People often get confused about what a casting number is. It was used primarily with the 26-spline input shaft and larger 32-spline output-shaft models, so it appears that they were looking to optimize strength everywhere possible since the 454 engine was introduced in 1970. Required fields are marked *. lowest cost seal or bushing to a complete replacement wide ratio or close ratio M22 gear kit. This is a good exampleof why looking at grooves on inputshafts may not be a sure method ofidentification. Gone is our old 383ci small-block and in its place is a Chevrolet Performance LS376/525 all-aluminum, fuel-injected crate engine that is probably underrated at 525 hp and 475 lb-ft of torque. These transmissions probably were assembled with special alloy gears, because the case casting is identical to the 3851325 as well. (Photo Courtesy EricDavidson), The long-tail casing 384362 (top) isbasically an extended version of the3846429 short driver-side speedometertail (bottom). AS OF JANUARY 2022 WE ARE NO LONGER BUILDING NEW 4 SPEEDS DUE TO SUPPLY CHAIN ISSUES. Click Image For More Details: Mainshaft Reverse Gear Muncie 4 Speed. Looking for a Muncie shifter engineered to fit within your budget? 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. 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. Here's another view of the M22's input shaft and countershaft. Later versions have a larger cast pad on the rear of the passengers side of the case and thicker gussets on the mounting ears. Phone: +1 855-230-5386. 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 is usually why certain castings may not correlate with one another. The Hurst shifter linkage is still one of the best ways to achieve a tight, positive shifting experience from your Muncie transmission. This is a page from an old factory 1967 Nova assembly manual showing threedifferent part numbers for the M20 and one number for the M21. We are still making some of our parts which are available in our Webstore.Feel free to contact us with any questions. See all 2 refurbished listings. Removal of the front bearing cover is where disassembly begins. This onehas a January 19, 1967, date code. However, the Rock Crusher was only equipped in cars that had high-performance big blocks, including the Corvette, Camaro, Firebird and Chevelle. Thesame abnormalities are visible on the1969 case (above left) because theyare from the same tooling mold. The casting number depends on the date the service case was installed. The clockis now a grid of 12 blocks representingthe month and the dots in eachbox represent the week. Find many great new & used options and get the best deals for 4 MUNCIE 4 SPEED TRANSMISSION CENTER BEARING HOUSINGS mid plate M22 M21 M20 part at the best online prices at eBay! However, GM made both 10- and 26-spline versions of the M20 and M21. Main cases manufactured prior to May 7, 1963, will say Patent Pending. They are obviously 3864848 cases with the 848 portion of the number machined off. Click . You must look at the gear ratios to tell a Muncie M20 from an M22. Muncie 4-speeds pretty much have a solid chronological order regarding the main case, retainer, midplate, and extension housing casting numbers. 14. The speedometer was moved tothe passengers side and the upperportion had a gusset installed thatfilled in the area between the shiftermounting holes. This is generally caused by pilot bearing failure that generally damages the input shaft. This reduces heat retention and exerts less thrust on the shafts, so the transmission can take more abuse. Stamped serial numbers for all 1969 model year cases also included the year designator. Of course, every company has a unique logo on its bolts. It is the heavy-duty version of the 2.20:1 ratio M21 four-speed.

Northwestern University Speech Pathology, Where Are Kawasaki Engines Made, Honda Harmony 215 Years Made, Articles M