Got a trans this weekend and wondering where the VIN/ID information is located? I found a few numbers, but I don't believe they are what I am looking for. I did find a date stamp/clock that indicates 1989. Thanks for any help.

 

Found the ID pad...now to decipher 0CJM289C. Anyone?

I am thinking (please correct me if I am wrong):
0= 1990
CJ= PLEASE HELP WITH THIS
M=4L60/700R4
289= Day of year
C= Third Shift

 

86-93 have a 3 letter ID code not the two you are looking at

CJM is documented in a GM 1990 truck TSB covering trucks , vans ,Astros and S10's

Is there a BIG letter cast on the bellhousing?

 

It does not have the big "K" however, it does have the "MD8" on the passenger side. The rear shaft is 27 spline, the front-big spline is 27 and the front-smaller spline is 30. "17" above the lock-up switch. Is it this small-front spline that dictates- I assume it must be since by 1990 they were no longer making the 27s? "8663549" Clock-like stamp is "89....6....10"

 

That is the convertor spline making it a late trans.
The large spline is for the stator inside the convertor
http://www.tciauto.com/tc/torque-converters-explained/