muncie codes

elevatordude

Well-known member
Joined
Dec 29, 2008
Messages
325
Location
Palmer, Ma.
Hey guys, I was wondering if someone knew a site with all the muncie codes. I have 388501 on the case its a 69 and I believe original to the car.

Thanks for your help
Ray
 
What is the casting number of the main case, and what is the "P" number stamped into the right rear vertical of the main case??? Crash
 
3885010 Main case was used 1966-67 model years only...
Your trans was built Dec. 30th 1965 for use in a 1966 model year car...
Hope this helps... Crash
 
3885010 Main case was used 1966-67 model years only...
Your trans was built Dec. 30th 1965 for use in a 1966 model year car...
Hope this helps... Crash


Hey thanks Crash I guess its not original to the car. One more question, is there a code to tell if its a m20,m21 or m22?
 
During the 1969 model year a ratio indicator was added to the "P" number, at the end and A=M-20, B=M-21, C=M-22... (P9A21B)

Your trans was built before this started... Crash
 
Ok here is what I have. I counted ten splines on the input shaft with one ring on the shaft.
Vette002-1.jpg
I believe the first gear is the main...(correct me if i am wrong) has 26 splines.

Vette004-1.jpg

And the output shaft has 27 splines.
Vette005-1.jpg
 
The input gear is fourth gear, and if it has 26 teeth that mesh with the cluster gear below it, its and M-21 close ratio(the one ring around the input splines also indicates M-21)... Crash
 
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