Tranny swap

[Kooli44]

Hey guys I'm new here. I have a 82 k10 shortbed. I pulled the 6.2 diesel and am putting in a crate 350. My question is the truck had a 4 speed Saginaw manual trans with a 208 transfer case. What is the best swap to automatic trans without having to modify everything in the driveline ?

 

[MadOgre]

Hey guys I'm new here. I have a 82 k10 shortbed. I pulled the 6.2 diesel and am putting in a crate 350. My question is the truck had a 4 speed Saginaw manual trans with a 208 transfer case. What is the best swap to automatic trans without having to modify everything in the driveline ?

If you pull the 208 off of the SM465 and find that it is a 10 spline input then you must change everything out. If it is not then a 4wd TH400 will accept the 208. However you will need to find a Th400/208 adapter as the 4 spd one will not work

I would scour the junkyards for something as a complete unit Tcase and Tranny.


Personally I would do a TH400 or 4L80 First, then secondly I would consider a 700r4 or TH350

The newer 241 Tcase is better than a 208 but the only one that came with a speedo cable was in 88/89

 

[CSFJ]

If you pull the 208 off of the SM465 and find that it is a 10 spline input then you must change everything out. If it is not then a 4wd TH400 will accept the 208. However you will need to find a Th400/208 adapter as the 4 spd one will not work

I would scour the junkyards for something as a complete unit Tcase and Tranny.


Personally I would do a TH400 or 4L80 First, then secondly I would consider a 700r4 or TH350

The newer 241 Tcase is better than a 208 but the only one that came with a speedo cable was in 88/89

I wonder if he has the 4 speed od instead of the 465 though. If I remember correctly, those were more common in the diesels. If that's the case, then that would be a 32 spline input on the t-case which would work with the turbo 400, with the right adapter.

 

[MadOgre]

I wonder if he has the 4 speed od instead of the 465 though. If I remember correctly, those were more common in the diesels. If that's the case, then that would be a 32 spline input on the t-case which would work with the turbo 400, with the right adapter.

Most if not all 465s in later years are the same and a TH400 will mate up to the 208 that was used behind the 465.


But if it is 10 splines then no luck

 

[CSFJ]

True. His is an '82 though. If it's got a 465 that's original to the truck, it'll be 10 spline. If I remember correctly, the 465 went to 32 spline around '85.

 

[bucket]

True. His is an '82 though. If it's got a 465 that's original to the truck, it'll be 10 spline. If I remember correctly, the 465 went to 32 spline around '85.

That only applies to a 1-ton truck with an NP205. 465/NP208 were 32 spline starting in '81, there were never any 10-spline NP208's.

 

[CSFJ]

Learned something new. Forgot all about the 465/208 combo.

 

[MadOgre]

That only applies to a 1-ton truck with an NP205. 465/NP208 were 32 spline starting in '81, there were never any 10-spline NP208's.

Oh ya that's right lol