The M21 & M22 is a four speed, RWD or 4WD transmission. The M21 & M22 is a Muncie engineering design, this transmission is aluminum case, extension housing and side cover. The side cover has seven bolts and two shift cams. The synchro rings have 35 teeth and the unit has a 4 step cluster gear. The reverse gears are helical cut and are …
Many people have guesses about deciphering M-22s. Like grooves in the input shaft and numbers and etc etc... The only way to tell is to open the case and measure the gear angle from the shaft centerline. M-20 and M-21 have 45 degree gears and M-22 have 22.5 degree gears. Fresh M-22s are going for $1300-$1600.
M22 transmissions can only be identified removing the selector cover(side cover) and visually identifying the straight cut gears-all other muncie transmissions had …
The 2.56:1 ratio is commonly referred to as the M20. Muncie also had a second close-ratio transmission designated M22 and often referred to as the "rock-crusher," which was used behind the highest-performance engines and in Corvettes, the M22 is a highly sought-after performance transmission. It is the heavy-duty version of the …
The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet's big-blocks in the mid-1960s. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both …
The M20 and M21 have the same cut to the gears, the M22 is a straighter cut resulting in a greater strength. Since the M20 and M21 look the same one way to tell them apart (aside from the grooves on the input shaft) is the tooth count on the cluster gear. There are 7 different input shaft possibilities on a Muncie.
The M20 and M21 used a gearset with a more angled tooth design on each gear (left). The M22 Rock Crusher used a gearset that features less of an angled-tooth gearing (right). Images courtesy …
1969-1974 codes include a suffix letter at the end to aid in identification of transmission ratios. A = 2.52 1st gear wide ratio M20, B=2.20 1st gear close ratio M21, C = 2.20 first gear Rock Crusher M22. One example code would be ( P0E21 A ) which reads: Muncie four speed aluminum for passenger car, 1970, May, 21st, ratio M20.
All 68 Muncies used the 660 case. A 68 M-22 will have a 10 tooth input spline with no rings in it and a 26 tooth output spline. You can't always go by the ring (or lack …
M22 Rock Crusher. Just bought a 1968 (originally was 427/435..currently has a CE replacement block from 69)) and I believe it has a M22 vice M21. Intent at some point in the near future is to crawl under and check numbers/code. I know it has the factory 411 rear end (Code FB) so that is the first reason I'm thinking it could be a M22- realize ...
Identifying Muncie 4- Speeds. Several things are needed to identify a Muncie correctly. The first is a main case casting number. Second a count of the input shaft and output shaft splines and if any rings or grooves exist around the input shaft splines. Third are date codes and VIN numbers that help confirm that the above case and gears belong together.
Muncie Rock Crusher Hotrunnersolutions Ingm muncie m rock crusher identification the m close ratio transmission is easily identified internally from the m and m versions by the angle of the gear teeth.muncie m22 rock crusher identification Mar 05, 2011 An M 22 Rock Crusher is a Muncie four speed transmission for cars made by General Motors in ...
The "Not recommended for general driving" refers to the famous M22 "Rock Crusher" Muncie four speed transmission. The M22 was exceptionally strong but, due to its straighter cut gears, had an audible whine. ... M22 4-Speed Man Transmission, close ratio, heavy duty 15 (0.05%) $237.00 ... The Vette Spotter app can identify the year of any Corvette.
The first time I heard the term "rock crusher" was in reference to the transmission in the 1967 L88 Corvette. Due to the low gear angle there is a fair amount of gear noise, really like a medium / heavy duty truck transmission. True enough the M22 did trickle out the door in 1965-67 and was buried in the option lists.
If it's got 10 splines and 2 grooves cut around its circumference, it's a M-20. If it has 10 splines and 1 or no grooves, it's a M-21. If it has 26 splines, it's a M-22. The original post said "without pulling it from the vehicle" Thus the request for any/all numbers on the trans to Help identify it.
1. The main case date code is usually found on the passenger side of the case just below the casting number. 2. The extension housing date code can usually be found on the …
rreruption. 507 posts · Joined 2006. #2 · Jun 3, 2006. I've installed them both.And In my opinion the M-22 is way better.The M-21 was close ratio but I've broken quite a few more of those,Than a M-22.The M-21 was good enough for a street driven cars,And racing.But the M-22 was far superior to it.I've only broke a M-22 twice.And I …
Across the top of the page are the words "First Build 4/15/65 – 1st Shipment 4/19/65, recap of M22 (Rock Crusher) Trans." By comparing these M22 transmission assemblies to Chevrolet's 1965 transmission identification codes, I found a perfect match. This transmission identification code list was issued by the Chevrolet Facilities and ...
The M22 transmission has a 20 degree helix angle on the gear set as opposed to a 45 degree angle found on the M20 and M21 and were made with a higher nickel alloy. The straighter angle was designed to produce less end loading of the gear train and less heat but created more noise, thus the nickname "Rock Crusher" was born.
How to Identify Muncie 4 Speed Transmissions. Identifying Muncie 4 Speeds III by Paul Cangialosi : The most popular question has to be that everyone thinks they have the famous "rockcrusher" M22 4 speed. This …
Joined Aug 27, 2004. 4,958 Posts. #21 · Oct 30, 2008. I love hearing this info from Tom and Jody. Real good info. I have the Autogear M22W in my 71 with 3.55 rear since early this year. I have no complaint. Works excellent with the 3.55 gear, and the whine it makes in 1 st, 2 nd and 3 rd causes the goosebumps to bleed, its awesome !!!!!
The bearing retainer slips over the input shaft and seals the transmission from the front. See All 34 Photos. Fully lubricate the detent levers and side arms with assembly lube. Move the spring ...
The M20 and M21 used a gearset with a more angled tooth design on each gear (left). The M22 Rock Crusher used a gearset that features less of an angled-tooth …
M22 transmissions can only be identified removing the selector cover(side cover) and visually identifying the straight cut gears-all other muncie transmissions had …
05. If your Muncie is anything like ours, a thorough cleaning is the first step in the rebuild process. Ours had years of accumulated oil and dirt. We recommend using some sort of product that ...
You can identify several unique signs that identify an M-22 "Rock Crusher," even if it does not have a GM hallmark imprinted on its surface. Step 1. Check the casting number, the …
im looking forward to the classic m22 whine with the new Auto Gear Muncie (ultra wide ratio) M22Z. It has 2.98/2.04/1.46/1 ratios. First gear 2.98x3.08 rear yields 9.2 in first. MUCH better than my previous clutch slipping setup with 2.64x2.73=7.2. With 27" (255/60/15) tires highway rpm should be 2300@60, 2500@65 and 3000@78 - thats nice.
M22 Rock Crusher. Jump to Latest Follow 2K views 6 replies 4 participants last post by DZAUTO Nov 11, 1999. C. catman Discussion starter 5 posts · Joined 1999 Add to quote; Only show this user #1 · Nov 9, 1999. A friend of mine is restoring his 70 SS Camero and found a M22 rock crusher cheap,, it needs work but I have seen certain …
M22 = stronger close ratio. Shifty Shifterton, Jun 26, 2008. SHARE POST #2. Deuces likes this. earl schieb. Member. from MID-TN across from the cows. Look on …
Jim Mac. 12592 posts · Joined 2004. #5 · Apr 24, 2022. hopefully he meant that a m22/rock crusher was rarer installed in a car. jim. Jim. 70 chevelle, SS clone 454 4 speed 3.31 12 bolt posi. 71 …
If your sure its a real M22, its a pretty rare transmission. THey go for about $800-1200 on EBay depending on condition. I know because I was once looking for on until I got a Borg warner instead. If its an M22, the input shaft should have no rings on it and the spline count should be 26. They are nice transmissions.
23 posts · Joined 2019. #1 · May 1, 2019. I am changing out my 700r4 to a muncie 22 rock crusher. I have a few questions: i just bought a 72 chevelle ss clone. The system is a chevy 383 stroker and 700r4 is the drive shaft i am using now. will the drive shaft have to be cut or lengthened if so by how much for the 383 stroker and m22 rock …
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 …
One of the best ways to identify a Muncie is the casting numbers on the external components of the transmission. Side Cover Casting Numbers. It is easy to determine an early Muncie four-speed ...
Chevy M22 Rock Crusher Manual Transmissions3 muncie 4 speeds were offered. the m20 wide ratio, the m21 close ratio, and the extra heavy duty close ratio m22, also known as the rock crusher . the m22 was generally installed behind severely powerful high torque bigblock engines. the m22 is distinguished from an m21 by the angle of the gear teeth ...
Look in the post at the top on the trans fourm. It tells how to pick out what is what but the main thing to look for in a M-22 is the gear angle. Take off the side cover …
Muncie M22 Rock Crusher Third Gear $ 112.00 Add to cart; Muncie M20 Wide Ratio Third Gear $ 118.00 Add to cart; Muncie 4 Speed Sleeve w/O-Ring $ 14.00 Add to cart; Muncie M20/M21/M22 Rear Reverse Idler Gear $ 59.00 Add to cart
The 764 extension housing indicates the transmission has a 32 spline output which all 71 through 74 M20, M21, and M22 Muncies and the 1970 M22 had. A M20 with the 32 spline output and 26 spline input is a desireable Muncie as it was stronger than earlier Muncie M20s. Be aware that they are also 3/4 inch longer than earlier 27 spline output …
Garry Brown on Super Pro Road/Race Muncie Upgraded Ultra Case M22 Rock-Crusher. SALE EXTENDED!!! Michael wilhelm on Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. Perfect Performance with 2.73 to 3.42 Rear End Gears. SALE EXTENDED!!! Ricky Fitts on Muncie Super Duty M23 Upgraded Ultra Case 4-speed …
M22 Rock Crusher - $2,500. Nov 17th 2023 562 1 Show phone number $2,500. Listing Number: 184499471 Report this listing. BILLINGS, MT, US No trades accepted ChandlerH38 (Private Seller) Share. Save. Msg. Call. Item description M22 Muncie Rock Crusher Yes has an M20 case, M22 internals ...