57 GMC- What 4sp would work?

[57 Jimmy]

Hi guys this is my 1st post I know no intro. I've lurked here awhile.
Anyway does anyone know if theres a direct swap to my stock 347 Poncho? say a late model or just any 4speed other than another creeper type truck trans.
Thanks for any help or tips.

[raycow]

If you have a bellhousing on the engine now, you can bolt up any common GM 3 or 4 speed car transmission or a T-5 from a Camaro or S-10. You can also use an aftermarket transmission like a TKO or Richmond. If you don't have a bellhousing, you will need to find one from a 55-59 GMC truck. A Pontiac car bellhousing will NOT have the mounts you need.

Ray

[57 Jimmy]

Raycow thats great. Do you know if the input splines are the same and or have to be lengthened or shortened or is this a direct bolt on ? Yes I have the orginal bellhousing the truck is driven as we speak, I just want to up grade or have a plan B if you know what I mean.
Thanks for your help.

[raycow]

Originally Posted by 57 Jimmy

Do you know if the input splines are the same and or have to be lengthened or shortened or is this a direct bolt on ?

If your replacement transmission has a 10 spline input shaft, everything inside the bellhousing stays the same. If it has a 26 spline input, you will have to change the clutch disc and that is all. The S-10 requires shortening the input shaft and bearing retainer as well as replacing the disc.

Ray

[57 Jimmy]

Thanks your knowlege is very valued, hope this helps someone else also.
Again thank you!