Muncie M20 or M21 or M22 - Team Camaro Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 12 (permalink) Old Oct 8th, 19, 07:47 PM Thread Starter
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Kevin
 
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Question Muncie M20 or M21 or M22

Trying to identify my Muncie 4 speed, assembled 1/25/1967
Can someone tell from pic's ?
The input shaft is 10 spline with 2 groves.
from the driveshift, it looks like the output shaft is 27 spline.
Thanks-
Kevin
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1968 RS Convertible
327
Black Exterior
Red Interior
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post #2 of 12 (permalink) Old Oct 8th, 19, 08:18 PM
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Dan
 
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Re: Muncie M20 or M21 or M22

Looks like M20.
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post #3 of 12 (permalink) Old Oct 9th, 19, 04:12 AM Thread Starter
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Re: Muncie M20 or M21 or M22

Thank you, that's what i was thinking.
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post #4 of 12 (permalink) Old Oct 9th, 19, 05:31 AM
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Ray
 
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Re: Muncie M20 or M21 or M22

On input shaft; 2 grooves is M20
1 groove is M21
0 groove is M22

'68 rs/SS 350 M-21 posi
numbers matching
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post #5 of 12 (permalink) Old Oct 9th, 19, 09:13 AM
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kevin
 
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Re: Muncie M20 or M21 or M22

Quote:
Originally Posted by rgwiz View Post
On input shaft; 2 grooves is M20
1 groove is M21
0 groove is M22
does this only apply if the transmission HAS NOT been rebuilt
I know mine has been rebuilt and the groves mean nothing now
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post #6 of 12 (permalink) Old Oct 9th, 19, 09:58 AM
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Re: Muncie M20 or M21 or M22

Quote:
Originally Posted by flat tire View Post

I know mine has been rebuilt and the groves mean nothing now

The teeth on the gear aren't changed when the transmission gets rebuilt. The grooves still mean what they did before.

Jon N

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post #7 of 12 (permalink) Old Oct 10th, 19, 02:16 AM
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Re: Muncie M20 or M21 or M22

Quote:
Originally Posted by dyno jonn View Post
The teeth on the gear aren't changed when the transmission gets rebuilt. The grooves still mean what they did before.
the front shaft on mine had 2 groves before being rebuilt. now it has none???????????
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post #8 of 12 (permalink) Old Oct 10th, 19, 03:59 AM
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Re: Muncie M20 or M21 or M22

Quote:
Originally Posted by flat tire View Post
the front shaft on mine had 2 groves before being rebuilt. now it has none???????????
Input shafts can be replaced due to wear, then no guarantee on the amount of grooves

Kevin


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post #9 of 12 (permalink) Old Oct 10th, 19, 05:05 AM
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ray
 
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Re: Muncie M20 or M21 or M22

Count the teeth is the only sure way.
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post #10 of 12 (permalink) Old Oct 10th, 19, 05:57 AM
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Re: Muncie M20 or M21 or M22

Quote:
Originally Posted by KevinW View Post
Input shafts can be replaced due to wear, then no guarantee on the amount of grooves
Quote:
Originally Posted by carcrazy615 View Post
Count the teeth is the only sure way.
Input shafts can also be replaced during a rebuild with used input shafts.

Pulling side cover and inspecting gears is the only sure way.
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post #11 of 12 (permalink) Old Oct 10th, 19, 06:42 AM
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Re: Muncie M20 or M21 or M22

When gears are changed, all bets are off. I used to build Muncies out of piles of parts taken from broken transmissions I had bought for pennies. Only way to identify what is in there after that kind of deal would be with pictures of the tranny with the side cover off, and tooth count of the gears, case number and pin size. Yes, I'm a swap meet buyer. Yes I can identify parts by sight. If you can't, you will be able to after a few years of making expensive mistakes.

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post #12 of 12 (permalink) Old Oct 10th, 19, 08:57 AM
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Re: Muncie M20 or M21 or M22

quote:When gears are changed, all bets are off.
well that is what I was getting at on my first post
the last transmission I had rebuilt, the guy cracked the case trying to remove a roll pin.
he had dozens of cases and told me to pick the one I wanted. so i sand blasted several to find a good case that he place my internals in a NEW case. so #s on the case mean nothing
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