
Muncie 4-Speed: The Complete History
This is the current Muncie M22. Your can see that the layout of the geartrain is identical to the ST10's. All gears and synchronizers are in the same position. Notice how the angle of the M22 gears is much straighter than on the ST10. The noise level increased because of this angle, giving the M22 the nickname "RockCrusher."

Muncie M22 Rock Crusher 4 speed | Hot Rod Forum
I do not claim to be a transmission expert and could be wrong but the "real" rock crushers had straight cut gears....not helical cut gears. I believe they were first released by GM in 1969 or 1970. I had one in my 1970 Chevelle SS 454-450HP LS6 car. I bought it new. The Rock Crusher was very noisy due to the straight cut gears.

M22 4 speed rock crusher | Team Chevelle
I have a 1970 m22 close ratio 4 speed from a 1970 ls6 I owned back I the 80s. Here is the info. ... Spending" 3000$ on a bolt on, period correct, grin inducing almighty and mythical transmission that is the great Muncie M22 Rock Crusher makes more sense for many compared to buying a retrofit kitted TKX for 5 000$.

Guide to Muncie M20, M21, and M22 Four-Speed …
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 wide- and close-ratio units. The M22 to come later in 1967-'74 is also a close-ratio unit, but much stronger than the M21, with a higher torque ...

How to Identify a M22 Rock Crusher | It Still Runs
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 production year and the gear ratios on the aluminum serial number plate attached to the …

How To Identify Chevy Four-Speed Transmissions
The Muncie four-speed was produced in two ratios: the wide ratio (M20) and the close-ratio (M21). That being said, there was a second, close-ratio version (M22) …

Is this a real M22 Rock Crusher? | Team Chevelle
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.

Identifying Muncie 4-Speeds
Identifying Muncie 4- Speeds. Several things are needed to identify a Muncie correctly. The first is a main case casting number. ... Ratios of the M20, M21, M22. Muncie 4-speeds were produced in two different ratios wide-ratio (M-20) and close-ratio (M-21). An extra heavy duty close-ratio version (M-22) was also offered on many of the big-block ...

m22 rock crusher | Hot Rod Forum
m22 rock crusher. Jump to Latest ... The above post's are right, except you cannot just rely on the input shaft, case number and such to identify it as an M22. There are virtually no unmolested M22's in existance today. Various gear manufactures make replacement gear sets for M22's that will fit in any case with a 1" countershaft.

Muncie 4 speed....M21, M22, Rock Crusher? | The H.A.M.B.
I currently have an M22 Rock crusher in my '56 Chevy pickup, and have another M22 that was rebuilt about 6 years ago by my father but never used. I also have what I believe is an M21, but I'm not certain. ... Go to it and click on "identification" and that page will tell you everything you need to know about muncie transmissions. You will be ...

NEW Auto Gear Upgraded Ultra Case Muncie HD M22 4-Speed Rock-Crusher
John DiLauro on Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. Perfect Performance with 2.73 to 3.42 Rear End Gears. SALE EXTENDED!!! 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. …

Muncie I.D. chart | Chevy Tri Five Forum
Although some claim that the M23 is a 'rock crusher', it is indicated that this box was assembled in both wide and close ratio components and also with straight cut gears common to the rock crusher (M22) transmission. This chart, so far, has been very accurate in identifying the muncie trans. over the years, so I wanted to share.

1967
GM Muncie transmission rebuilt and guaranteed for 1 year. Correct fit for all 1967 - 1968 model Camaros. This one will have the studs coming out from the side where your shifter linkage mounts. This is the Muncie M-22 Rockcrusher four speed. Designed for the highest performance models.

M22 Identification | Team Chevelle
Can you help identify if it is truly an M22. The number reads 3925856(or possibly 3925858) All the sites I have visited are telling me the case number should be 3925661/ ... Doe this mean it's still an M22 but just manufactured at the Saginaw assembly plant or it's not an M22 "Rock Crusher Transmission". I am just learning !

New Auto Gear Upgraded Ultra Case Muncie HD M22 4-Speed Rock-Crusher
John DiLauro on Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. Perfect Performance with 2.73 to 3.42 Rear End Gears. SALE EXTENDED!!! 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. …

Muncie M-22 or tremec 5 speed | Team Camaro Tech
I was planning on getting a muncie rock crusher for my 68 cause ive heard theyre awesome trannies. But lately ive been reading that the tremecs are pretty good. ... I just had an Autogear M22 built and like it. However, that overdirve would be nice for close to the same $. The other thing to consider is the first gear ratio coupled with your ...

Muncie 4-Speed Identification Guide
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 …

M21 M22 4 Speed Muncie Manual Transmission
Below we provide a M21 & M22 parts illustration to assist you with the correct identification of the parts you need. Select the parts you require from the following list and give us a call. ... Rebuilt Transmission M22 1966-1974 Rock Crusher MTGM038. Rebuilt Overhaul Bearing Kits M21 & M22 Transmission. Kits w/OE Style Bearings.

How to Build a Bulletproof Muncie M22 Four-Speed …
The Muncie M22 is known as the Rock Crusher. See how we improve its strength and versatility by adding a Gear Vendors Overdrive. Cam Benty Writer John McGann Photographer Nov 04, 2022.

NEW Muncie M22 SUPER ROCK CRUSHER 4 speed …
The Gear Box is the source for Muncie Parts like the new assembled M22 SUPER ROCK CRUSHER 4 speed kit with micro super finish or downshift case support. The Gear Box Transmissions. Muncie-Tremec-Saginaw-TKO-Top Loader-Richmond. Home: View Cart: Muncie Kits & Parts: T56: T56 Corvette GTO CTSV: TR6060 / T56 Magnum: T10: Super …

How to Identify a Muncie Four Speed
Identifying The Muncie. ... There also was a second, heavy-duty close-ratio version: the "Rock Crusher" (M22) that was offered on some of the high-performance big-block models, starting with the ...

Identifying Muncie 4 Speeds III by Paul Cangialosi
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 had the …

Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4 …
STRONGEST Direct Replacement M22 With NEW Muncie AUTO GEAR ULTRA CASE With The Strongest M22z ULTRAWIDE RATIO 4 SPEED TRANSMISSION. A GREAT HEAVY DUTY ROCKCRUSHER FOR YOUR CAMARO, NOVA, CHEVELLE, CORVETTE, GTO,442. THE MAIN CASE IS THE STRONGEST MADE with fill and drain plugs. C355 …

M-22 "rock crusher"
ORIGINALLY, in the beginning of the Muncie evolution, there was the M20(wide ratio) and the M21(close ratio). A VERY, VERY, VERY few Heavy Duty, close ratio Muncies were specially built for severe duty service (such as for the 425hp/396 Corvettes) in 1965. THEY WERE NOT CALLED M22 IN 65-----they were simply a Heavy …

GM Muncie 4-Speed Decoding : Drivin' It Home
M-22 "Rock Crusher" Identification. The M-22 close-ratio transmission is easily identified internally from the M-20 and M-21 versions by the angle of the gear teeth. The M-22 was only produced in a close-ratio version, so it will not appear on models with high rear-axle ratios (3.55 or lower numerically) unless someone has changed it.

M-22 "rock crusher"
Thus, bottom line, ONLY the M22 is "properly" nicknamed as "Rock Crusher". And, some people, who just flat do not know what they are talking about …

The 1965 Chevrolet M22 Rockcrusher …
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 …

When was the M22 first called "rock crusher"?
True enough the M22 did trickle out the door in 1965-67 and was buried in the option lists. It was around 1968 that easy to find the M22 on option lists, but the significant extra cost was a way to dissuade all but the most serious of gearheads. Drain plugs came to the M22 first, as did the fine splines.

Muncie Calendar Date Codes — D.M.E. Transmissions
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.