The Stovebolt Site Forums The Shop Area Driveline What to do? Transmission help. (pics)

I need to replace (or rebuild) my 3 speed column shift for my '51. I found a guy who was scrapping 4 column shift transmissions. When he sent me the pic, only Transmission #1 will work. I think the other three are car transmissions.
All 4 transmissions in 1 pic.

I know its a lot to put in one post but I don't know anything about transmissions.

I want to gut one or two to rebuild mine so I can limit the purchase of all new parts.

My transmission serial number pics.
Shifter cover serial number
Transmission serial

3 questions:
#1 - Will Transmission #1 work for my truck?

#2 - Are the internals in all 4 the same? (so I have 4 to sacrifice into one?)

#3 - How do I understand the transmission serial number coding? Or does it matter with what is here?

Here is what the guy sent me.

Transmission #1 - 10 spline input 10 spline out casting #3886932 GM stamped # G O 84498

I'm pretty sure these are car transmissions...
Transmission #2 - 10 spline input yoke on output casting # GM 30 591814
Transmission #3 - 10 spline input yoke on output casting # GM 17 591747
Transmission #4 - 10 sline input heaver input shaft than others yoke on output casting #GM 7 591747

The one on the right is the only one that looks like it will fit. There are variations in the side covers & shafts. You can use your old side cover iuf nessesary. If the other one feels good & turns good I think I would just put it in & try it. Used manual trans. are usually good.

The one on the right will work as it's the same as mine.

Does anyone know if the gears etc inside the car transmissions can replace those in the truck transmission?

I'm pretty sure that transmissions 2-4 are pre 47 gear boxes based on the trans to bellhousing bolt pattern. They could be truck or car. It would be a crap shoot that the internal parts are the same.
Fred

If you have casting numbers of the case, you can find what interchanges in a Hollander, but its a tedious job.

The internals are not the same for car and truck.
The main difference is the counter shaft in a car trans uses a bushing and the truck needle bearing so they will not interchange. The rear bushing and housing are different as well. The gear ratios are different so most of the gears will not work. I think the syncro slider will interchange but not positive.

I have several good truck 3 speeds and have in the past gutted a trans and shipped just the internals in a flat rate USPS box. If your stuck for parts let me know and I'll check out what I have.