Tranny Decode Help
 

Hoping someone can decipher this tranny stamp? Friend of mine has it and says he isn't sure what it is from??

Any help appreciated

Mike

P9RO1A

1969
OCTOBER
1ST day
M20 transmission


i believe this is what you have

thx
chris

Thanks Chris. I guess I should have indicated I'm trying to figure out what brand car by virtue of the vin font and style. Camaro. Chevelle. Prius :)

69 Camaro. Specifically a N (Norwood, Ohio) built car

Partial vin starts with 1 for Chevrolet 9 for 1969 Norwood 1969 Camaro

Thank you everyone!!

Is the trans from a Z28

trans
 

there is no way to tell

----Being an M20 I would think it odd that the trans might have come in a Z!......Bill S

I just sold a complete 69 z28 numbers matching DZ motor with Vin matched M20 muncie.

M20 is geared better than a M21 or M22 for the 302...

Agreed. Was going to mention that, but figured someone else may point that out.

Just curious because its a late car My Z is 11A and the trans is P9R21B

A high percentage of Z28's came with M20 and believe above 30%. Talk about unusual, how a out an M 20 in several COPO's

----I agree with all of your thoughts on M20's in Z's. The ratios do work really well. Back in the day though it seemed like everyone ordered M-21's simply because they heard that M21's were the "performance" trans. I am mildly surprised at the 30%. Apparently there were that many people ordering Z's that felt M20's would be the better choice...….Bill S

My Lemans Blue car was M20 4.10's the black car was set up that way as well...
If your buddy had a M21 3.73 car and you had a 4.10 M20 car you would swear he was pulling an anchor behind his car if you drove it.

M20 4.10 is the best gear ratio for a 302... it is SO much fun to drive and really very easy to drive stop light to stop light with 2.52 first.