ok, so the stamped numbers im guessing are supposed to be the same right? im getting what looks like 2 different numbers, both arent quite full punches. like they didnt get a good one on the first so they tried again. anyways first set of numbers on the flat spot are

2A7S52599
8A7532599 im guessing its a mix of the both of them. those are the stamped numbers, cast are

housing 3925656
tail 352254
cover 6261888
10 spline input shaft.
any info you guys could help me with would be great. ive searched on it already but didnt quite get what im looking for. guess theres supposed to be a shorter number but im not seeing anything else. theres a piece that looks like it maybe would have been that small section but it didnt come though on the casting.

 

heres a pic of the casting. its the one right above the GM cast that i think should be the shorter number that would help me with the info, year, what car it came from.

 

ok, found whre theres more numbers, was covered by good ol RTV. the duct tape of gasket makers. ROS21

 

1970-75 for the main case, not finding the tail housing or side cover.

 

 

groves on input shaft 3, so i found this for the gear ratio

3 3.50 2.48 1.65 1.00

 

WOW! A 5 spd! But 1st is higher than 2nd???

 

3 is the grove count on the input shaft. There's 0, 1, 2 & 3.

 

There was a in there.

 

# of grooves 1st 2nd 3rd 4th Notes:
0 2.85 2.02 1.35 1.00
1 2.56 1.81 1.37 1.00 Third gear on cluster has 25 teeth
1 2.56 1.81 1.44 1.00 Third gear on cluster has 21 teeth
2 3.11 2.20 1.47 1.00
3 3.50 2.48 1.65 1.00