Muncie M22 Rock Crusher 4 speed - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-22-2003, 01:26 PM
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Post 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

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Old 02-22-2003, 01:39 PM
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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.

Maybe someone in the past (it has been 30 years) put all the goodies in a early case maybe?

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Old 02-22-2003, 01:57 PM
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The m22 was available as early as 1965 in Corvetts
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Old 08-18-2003, 01:29 PM
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I had a 71 GTO with a M22 "rock crusher". This was an absolutely stout transmission. Had a distinctive "whine" due to the slanted gears.
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Old 08-18-2003, 04:26 PM
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Quote:
Originally posted by palcu
I had a 71 GTO with a M22 "rock crusher". This was an absolutely stout transmission. Had a distinctive "whine" due to the slanted gears.
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.

Vince
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Old 08-19-2003, 12:16 PM
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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
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Old 08-20-2003, 05:09 PM
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Everything you wanted to know about Muncies.

http://www.gearzone.net/muncie.htm

Vince
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