Burgundy 69

I am getting ready to bring my 69 SB to the shop to have the extension housing rebuilt (bearings, seals, gears, gaskets, etc) and I need to verify the transmission (M-20 vs M-21). So, tonite I crawled under the car and jotted down the number from the passenger side of the case which read, 3925660. I checked my reference and it shows that this number is valid for 68 thru 70 M20 and M-21. So, I am still uncertain which trans I have. Can anyone help? Thanks.


mark

mike229

Look for the date code - begins with a 'P' and ends with and A, B, or C

like this P01253C

A=M20
B=M21
C=M22