Tranny numbers
Thread Starter
Instructor
Joined: Jun 2001
Posts: 229
Likes: 1
From: Uxbridge MA
Tranny numbers
I was looking to get a rebuild kit from gear zone, so I figures I would get some numbers of the Muncie. I am at a loss to explain what I found. The numbers I found appear to be from 1970 in my 1969 according to the books I have. Plus isn't there a digit at the end of the code to say what type of Muncie it is (A,B,C)? I saw no codes. I think the tranny has been replaced.:mad Let me know what you think:
P0307 on tranny (The 3 could be a B not sure)
3885010 stamped on tranny case.
--Andy
[Modified by andyg, 4:44 PM 3/9/2002]
P0307 on tranny (The 3 could be a B not sure)
3885010 stamped on tranny case.
--Andy
[Modified by andyg, 4:44 PM 3/9/2002]
Drifting
Joined: Oct 2000
Posts: 1,825
Likes: 56
From: Shawano WI
Re: Tranny numbers (andyg)
P0307 on tranny (The 3 could be a B not sure)
3885010 stamped on tranny case.
3885010 stamped on tranny case.
The case casting number 3885010 was only used from 65 -67.
The P0307 code was used up through 1966. So the trans was built either March 07 1965 or March 07 1966.
For those years the rings on the input should either be no ring or 2 rings for a M-20, or 1 ring for and M-21.
Thread Starter
Instructor
Joined: Jun 2001
Posts: 229
Likes: 1
From: Uxbridge MA
Re: Tranny numbers (Pete79L82)
So does that say this tranny was replaced at some point in its life? I am under the assumption that the stamp should match the year of the car, so I should have seen a P9 number instead of a P0. Also I was told it was a M21. How can I tell.
Drifting
Joined: Oct 2000
Posts: 1,825
Likes: 56
From: Shawano WI
Re: Tranny numbers (andyg)
So does that say this tranny was replaced at some point in its life? I am under the assumption that the stamp should match the year of the car, so I should have seen a P9 number instead of a P0. Also I was told it was a M21. How can I tell.
The 3885010 case would not have been original to a 69. The original case should be 3925660.
The date code for 66 and prior was P=Muncie and 4 number indicating month and day. No designation for year.
The date code for 67 and up was P=Muncie, number indicating year, letter indicating month, and 2 numbers indicating day. Something like P9C15 would indicat a Muncie built in 69,March,15.
If you are doing a rebuiild and have the sidecover off, count the teeth on the input shaft. 21 or 24 teeth will be and M-20, 26 teeth will be an M-21. (Note: this is tooth count, not spline count)
