c2 transmission - help with serial

[Michael V.]

I recently pulled my c2 4speed and found that the "serial numbers" don't match
can someone help me with the deciphering so I can see what year it came out of?

3851325

PO128

serial -j185273

thank you

[David B.]

Re: c2 transmission - help with serial

"P" = Represents Muncie built four speed passenger transmission (code on 66 print)
"01" = 1st month (January)
"28" = Day of month

3851325 Embossed cast # on side of case common C2 4 speed case (many changes internally)

J185273 Transmission ID code letters on top PS of case (would indicate probably late 63 to 66 did not check further)

#s on Metallic tag attached to lower front bolt of side cover (if still there) will tell you whats inside trans

[Donald H.]

Re: c2 transmission - help with serial

The casting code 3851325 is from a 1964 or 1965 vehicle. Could be an M20 or M21. The side cover should have casting #3831707, and the tail housing should have casting 3846429 (64 and early 65) or 3857584 (late 65)

So the assembly code as Dave indicated would be January 28, 1964 or 1965.

I believe the J185273 is actually the VIN of the vehicle the transmission came from. What I found in one of Alan Clovin's books is that the J designated the Janesville Wisconsin plant. That plant built passenger cars, so your transmission likely came from a passenger car. However, if all the castings are correct as I indicated above, the transmission should be correct for a 1965 corvette, just didn't originate in a corvette.

[Michael V.]

Re: c2 transmission - help with serial

thank you for your help