The Stovebolt Site Forums The Shop Area Driveline 3spd top loader-how to identify

Good Evening,
I have recently obtained two 3spd trannies, which have different markings on the left side of the case. I am looking to find out what the cast numbers mean. If someone can point me in the right direction, I would greatly appreciate it. They have the following cast into the left side of the case:

One looks like this The other looks so
591195 591195
GM1 GM2
41
D231 J247
Thanks, Richard

This may help. GM used many,many casting numbers and supposedly didn't keep good track of them. Roll to the bottom of the page for std.trans.


http://www.chevcarclubvic.org.au/technical/gm_transmission_identification.htm

What do you mean by top loader? Do you mean a top loader like a Borg Warner or a 3 speed with a stick?

G'morning,

Sorry for the confusion. A tranny with a stick as opposed to a column shift or side loader. I beleive it to be from a 41-4? tranny, I will use it for a '46 Suburban. What I am looking to find out is there a difference in the gears denoted by the casting numbers? Thanks again, Richard

Casting No. 591195 is correct for a Chev or GMC pickup from 41 to 47 first series. If both cases have the same casting numbers, they are the same. The other numbers are dates, etc.

Hey There Shop Shark,
Thank you most kindly. The other difference is the torque tubes?? (drive shaft couplers?) are different lengths. Would this be for different years or different models ie: 1/2 or 3/4 ton? Richard

A 1/2 ton uses a full torque tube while a 3/4 ton uses a torque tube to the center bearing and open from there to the rear. A 1/2 ton in the 40's used a different U-joint at the rear of the transmission than a 3/4 ton.

Hello Again,
Thanks for the information. I believe either of the transmissions I have will work for my application. Now just ot get them cleaned and reconditioned. Into the Burb and away we go!!

All the best to all, Richard