Guide to Muncie M20, M21, and M22 Four-Speed …

The M22 Rock Crusher 26-spline input shaft sports a wider gear for greater torque capacity. Just because you've found a 26-spline input shaft does not mean you've found an M22 input shaft, which is made of a stronger alloy. The standard 10-spline input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74. 9.

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The 1965 Chevrolet M22 Rockcrusher Transmission: The …

By comparing these M22 transmission assemblies to Chevrolet's 1965 transmission identification codes, I found a perfect match. This transmission identification code …

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M22 Rock Crusher

M22 Rock Crusher. Jump to Latest ... Check the gears and make sure it really is a M22, no other way to confirm it. I must of looked dozens of muncies that were supposed to be M22s, but popping the side cover off told otherwise...-----70 chevelle ss396 conv 66 chevelle ss396 hdp/conv 55 chevy prostreet ...

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M22 Rock Crusher

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 there of) on …

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The Story of the Mighty & Majestic Muncie 4 Speed …

The M22 was eventually dubbed the "Rock Crusher". It is a common misconception that all Muncie transmissions are "Rock Crushers", but it is only the M22 that deserves that name. The M20 and M21 were both release in 1963, but it wasn't until 1965 that the M22 hit the market. The M22 was created for the Corvette Grand Sport racing program.

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Muncie m20 vs M21

M20 has weak internals and case but ok for street and chirping street tires, the M21 is a better choice for muscle on the street and a little weekend drag racing but the case is week Ive sheared the case ears off and twisted off tail shafts when running wrinkle wall slicks, the M22 (the rock crusher as we racers called them) are designed to take abuse from high HP and high …

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Muncie M-22 Rock Crusher

Leaks out of the cluster gear shaft both front and rear at the mid plate. People think the "Rock Crusher" is special or stronger than a standard wide box Muncie. It is special in …

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M22

What you will get in our 'Syracuse' M22 is a gearset that is stronger, more durable and cooler running. The gearsets are available in three ratios: The classic Rock Crusher M22 (2.20/1.64/1.27/1.00) for your 3.73:1+ rear axle gear. The AutoGear wide M22W (2.56/1.75/1.36/1.00) for your 3.42:1 – 4.11:1 rear axle gear.

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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$.

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1971 Muncie M22 3925661 Muncie Trans 4 Speed P1B03C …

This is a Very Rare and Completely and Freshly Rebuilt M-22 Transmission with REAL GM Rock Crusher Gears for 1970 1971 and 1972 GM Vehicles including, Chevy, Corvette, Camaro, Chevelle and other GM vehicles of that vintage These first came out in the 1970 Chevelle with the fine spline input and they were then released in the 1971 and 1972 Corvettes and other GM …

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Why is the Muncie M22 called the rock crusher?

The reduced gear angle of the M22 created a problem with noise (hence the name "rock-crusher"). Performance seekers decided to live with the noise when the benefits of …

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M-22 "rock crusher" | Page 2

come guys, every gearhead knows every muncie is a rock crusher, every 327 came out of a corvette and all 12 bolts are posi's! I didn't even read this on the internet, 70% of the guys at the gas station tells me this when I'm gassing up, they all had that rare 68 chevy with a corvette 327, rock crusher muncie and a 12 bolt posi that they would shift from first to second …

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M22 oil?

i have an m22 rock crusher, i'd like to change the oil, but im not sure what type of oil ... Amsoil makes a gear oil that mentions that its good for Muncies I think it's 80-90 wt. Its more important to check the GRADE of the oil. 72 ss 454 "W" code,w/cowl induction (how many left?)

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How much is a MUNCIE M22 now? and some questions

The M22 "Rockcrusher" as it was called went behind the LS6, L88 and other hi po GM stuff as early as '65 in vettes. The M22 and M21 were close ratio trannies for hi performance (3.73 or lower). M20 was the wide ratio version (3.55 or higher). The M22 had heavier syncros, sharper gear cuts heavy duty shafts and bearings. M22 and M21 share the ...

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Muncie 4-Speed: The Complete History

These special units evolved into what is called the M22 today. According to research by Alan Colvin (author of the Chev­rolet by the Numbers books), 57 M22 units were actually built for 1965 production. ... Because larger spline …

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Muncie M22 Rock Crusher 4 speed

Can someone tell me how much a muncie m22 rock crusher is worth this transmission was produced buy gm in 1966&1967 . ... M22 had straight cut gears, all other Muncies had helical cut gears. The straight cut gears gave the M22 it's different sound. Other Muncies were quite compared to the M22.

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Muncie m22 vs T-10

Muncies replaced them in about'63 in Chevys because a stronger trans was needed. The aluminum case Super T10 is a whole different animal. It was brought out around '73 (approx). It is as strong or stronger than a Muncie M22. An NHRA Stock Elim guy I know runs a Super T10. He says it lasts much longer than Muncies did, but I think they were M20's.

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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. ... 69-74 Muncies had a letter code after the date, to indicate which Muncie the trans was. "A" = M-20 ...

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M22 Identification

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 ! ... Also there is an outfit called Medatronics that is offering a re-engineered/new M22 for about $ 1800, any comments on these re-engineered units ? ... The 70 Chevelles with Muncies had a ...

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M22-Wide vs M22 "Rock Crusher"

There are now aftermarket replacement gears, gear sets and complete reproduction Muncies available. The reproduction trannys are available in all of the original …

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When was the M22 first called "rock crusher"?

The M21 and the M22 are both "close ratios", with the same ratios. The main difference is the helical angle differences with the gear teeth... M21 had a greater angle, which …

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Munci M22 or Richmond Super T10 4 Speed

In the past few years I have converted 3 Muncies (including the one in our 70) with M22W gears. The result is added strength of an M22, PLUS, for bragging rights, I can honestly say I have a "rock crusher" in the 70, and I just like having the whine of an M22. And very last, Chevelles were built with Muncies. The Super T-10 did not come along ...

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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. Be aware that they are also 3/4 inch longer than earlier 27 spline output Muncies.

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1967

GM Muncie transmission rebuilt and guaranteed for 1 year. Correct fit for all 1967 - 1968 model Chevelles and Novas. 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.

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M20-M21-or M22

This is a 661 case which is the last of the 3 style cases made dated Feb. 1, 1971 and a ratio of C for M-22 2:20 ratio Rock crusher, however these gears are not Rock crusher and must have been changed, they appear to be M-21 gears 2:20 ratio The tailhousing is a 774 which is the large housing that takes the 400 turbo yoke Muncieman

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m22 rock crusher

The early M20 muncies with the 7/8 pin counter shaft had no rings around the input. They are 10 spline input shafts. 95 % of the time these transmissions get confused with the M22. The only way to be 100 percent positive is to pull the side cover and look at the gears.

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The Muncie 4 Speed Transmission Taught A Generation Of …

To do so, it needed an even tougher gearbox than the M21, and while the Grand Sport never made it to Le Mans due to GM politics removing its brands from motorsports competition, the Bowtie brand was able to test the Muncie enough to develop a newer version that eventually hit the streets as the M22. The M22 'Rock Crusher' featured a one-inch ...

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M-22 "rock crusher"

I've converted 2 Muncies to M22W ratios. One is in our 70 conv and I really love it (vanity I guess). 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 (BS'ers), or they just …

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are all m muncies called rock crushers

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. Looks like you have a second design-feb. 28th, 1968, M20 or M21. Definitely not a rock crusher(no straight cut gears).

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1969

Complete original GM Muncie transmission rebuilt and guaranteed for 1 year. Correct fit for all 1969 - 1973 model Chevelles and Novas. This one will have the holes on the side where a bolt will secure your shifter linkage levers. This is …

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