Muncie M21 or M22 ?

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Feb 10, 2008 | 12:27 PM

pmihaltian

Thread Starter

Slingshot

Joined: Dec 2001

Posts: 3,817

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From: Charlotte NC

Muncie M21 or M22 ?

How do you tell the difference between a Muncie M21 and M22 transmissions? Also, are all M21 close ratio? If not, how do you tell a wide ratio from a close ratio sans pulling it apart and counting teeth?

Feb 10, 2008 | 01:44 PM

dmayhew

Drifting

Joined: Oct 2007

Posts: 1,254

Likes: 5

From: Brown Summit North Carolina

All M21's and M22's are close ratio , the difference in a M21 and a M22 is the angel of the gears. A M22 is a heavy duty unit designed for road racing like the Trans Am series racing. There is less angle to the M22 gears. That causes them to have a loud winning noise but are stronger.

The case on a M21 has a B at the end of the ID and a M22 has a C

David

Feb 10, 2008 | 01:54 PM

maddmickey

Instructor

Joined: Aug 2007

Posts: 122

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From: Enterprise Ut

That is the difference between the m20 and m21. M21 is close ratio, and the m20 is wide ratio.

Feb 10, 2008 | 02:49 PM

Belgian1979vette

Melting Slicks

Joined: Mar 2002

Posts: 2,164

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From: Beringen

M22's had gears with a higher nickel content, thus being stronger. The close ratio's was also a strength feature since the fall in rpm's from one gear to another was lower, hence less impact.

Feb 10, 2008 | 10:05 PM

bojangies46

Racer

Joined: Jan 2008

Posts: 386

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From: macks creek mo

In the movie two lane blacktop you can hear the wine of the gears, I love M22s

Feb 11, 2008 | 07:48 AM

vettesbydesign

Safety Car

Joined: Aug 2006

Posts: 4,102

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From: Forsyth Illinois

Quote:

Originally Posted by bojangies46

In the movie two lane blacktop you can hear the wine of the gears, I love M22s

That was a awesome movie!Have any idea where I can find a DVD copy of that?It's been years since I've seen it.

The M22 usually has no groves on the input shaft,the M21 has one,and the M20 has 2.The M22 has the drain plug at the bottom for the trans oil to be drained.The others don't.M22s,and all the muncies are great trans,but don't just get one because of the muncie hype.The Super T10 is also, a great trans,and usually cheaper.The Corvette speedo on muncie's is also,on the RH side,where the other mucies available in other GM cars is on the other side......