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) that was developed to survive duty behind engines with a …

GENERAL MOTORS MUNCIE 4-SPEED MANUAL …

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Why is the Muncie M22 called the rock crusher?

In the 1970s, virtually all Muncie four-speeds had 26-spline input shafts. 8. The M22 Rock Crusher 26-spline input shaft sports a wider gear for greater torque capacity. How much oil does a m20b25 take? ... 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 ...

Muncie I.D. chart | Chevy Tri Five Forum

M22 transmissions can only be identified removing the selector cover(side cover) and visually identifying the straight cut gears-all other muncie transmissions had conical cut(angle) gears. The most well known Muncie …

Muncie M22 Rock Crusher Third Gear

Muncie M22 Rock Crusher First Gear $ 119.00 Add to cart; Technical Resources. Competition Plus Catalog; Installation Instructions for Hurst Shifters; Muncie Identification; Speedometer Gear Calculator; T10 Indentification; Transmission ID; Follow Us. Top Brands. ACCEL; Advance Adapters; American Rebel; Anvil Off-Road; APR; ARP; Auto Gear ...

Muncie 4-Speed Identification Guide

Identifying muncie m22 vs m20 transmissions

By examining gear ratios and physical differences, we'll uncover the essential details that can help us identify each transmission accurately. Join us as we unravel the nuances between these two iconic gearboxes and enhance our knowledge of Muncie transmissions. Key Features of the Muncie M22 Transmission

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.

GM Muncie 4-Speed Decoding

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 …

en/166/1967 m22 rock crusher transmission.md at main

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Muncie M22 Rock Crusher Input 10 Spline

Muncie M22 Rock Crusher Cluster Gear 1″ $ 210.00 – $ 242.00 Select options This product has multiple variants. The options may be chosen on the product page Muncie M22 Rock Crusher Second Gear $ 115.00 Add to cart; Muncie M20 Wide Ratio First Gear $ 126.00 – $ 150.00 Select options This product has multiple variants. The options may be ...

How to Identify a M22 Rock Crusher

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 …

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) that was …

Muncie M-22 Rock Crusher

People think the "Rock Crusher" is special or stronger than a standard wide box Muncie. It is special in terms of price but it isn't any stronger. The "Rock Crusher" was built for road racing, with the angle of the gears straightened out to prevent excessive wear in the front bearings due to the forward thrust component of the force vectors ...

Muncie 4-speed Transmissions | The Online …

The term "rock crusher" refers to the noise made by the meshing of the stronger helical gears in the M22. Later model 1971-'74 Muncies are also popular with racers, because these transmissions used a 32-spline output that …

Rock Crusher identity

The only way to tell an M22 is by looking at the gear set. You cannot go by the old method of "it has a drain plug so it's an M22". Also the input shaft cannot be used as a guide because there are various firms now …

Muncie 3 speed transmissions

GTO 3-Speed Transmission, 1972 GTO, Heavy Duty 3-speed transmission, Dearborn, Muncie, M13, M12, Muncie M20, M22 rock crusher, Auto Round-Up MagazineA: L.C., thanks for the nice words. The transmission listed on the build sheet you sent me is indeed the Heavy Duty 3-speed transmission I spoke of in the a recent Auto Roundup/Car Collector …

'69 Z28 Transmission

I believe all first gen Z/28s were available with only the close ratio Muncies. This would be the M21, which most had, and the M22 which very few had. You're right about the guy being way off. Guys always say they've got a rock crusher when they are refering to any Muncie, there are big differences as we know. The M20 is a great trans though.

Identifying Muncie 4 Speeds III by Paul Cangialosi

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 had the same gear …

M22 4 speed rock crusher

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$.

Muncie M22 Rock Crusher 4 speed

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.

M-22 Muncie Rock Crusher for sale

Muncie M22 4 Speed Rock Crusher Gear Kit - Input Cluster 1st 2nd 3rd Idler Gear. Opens in a new window or tab. Brand New. C $857.89. Buy It Now. from United States. Sponsored. acerl (42,258) 98.2%. How to Rebuild Muncie 4-Speed Manual Transmission M20 M21 M22 Rock Crusher. Opens in a new window or tab. Brand New. C $52.67.

M22 Rock Crusher

C3 General - 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...

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-ratio), and M22 (heavy-duty close-ratio). (The M does not …

M22-Wide vs M22 "Rock Crusher"

In the beginning, the M-22 was the Heavy Duty Muncie, and it was available ONLY in the close ratio version (2.20:1 first gear ratio). The primary difference between the regular close ratio Muncie (M-21) and the HD Muncie was the angle at which the gear teeth were cut.

Is this a real M22 Rock Crusher?

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.

Muncie Identification | The H.A.M.B.

M22 transmissions can only be identified removing the selector cover(side cover) and visually identifying the straight cut gears-all other muncie transmissions had conical cut(angle) gears. The most well known Muncie …

1969 CAMARO Z28, MATCHING #'S DZ-CODE 302 & M22 ROCK CRUSHER …

it also retains its numbers matching muncie m22 rock crusher 4-speed transmission and its original 12 bolt posi rear-end with factory 4.10 gears. car is finished in its code correct 52 garnet red paint with white rally stripes. also has its correct code 718 red interior - very rare color combo on this z28. has front power disc brakes, factory ...

How to Identify Your Muncie 4-Speed Transmission

M22: Known as the "Rock Crusher", designed for high-torque applications. Using these tips, you can confirm whether you have the right transmission for your Chevy and make informed decisions about any potential restorations or modifications. Feel free to share your findings or ask if you have questions about specific codes you encounter!

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."