School me on 203/205 combos

Grama · May 5, 2009

So I am in the process of gathering parts for rig to snow wheel in. I really want to do a 203/205 combo to allow for a few different gear choices. My question is I have a 203 that was behind a th-350 and i want to mate that to my 205. The 205 is currently in a 1984 1ton chevy behind an sm465. Do i have to convert this to 32 spline to mate it my 203? Also is there a stock adapter from the sm465 to 203?

Thanks a ton
Graeme

bigiron · May 5, 2009

you will need to convert it to 32 spline as well as bore the input bearing hole in the front of the 205 case to the size of a turbo 400 input bearing.... all the kits that I am aware of provide a output shaft for the 203 that require the 32spline input on the 205 and yes there is a 465 to 203 adaptor there are somwhat hard to find but out there

Boonie Buster · May 5, 2009

find a chevy 205 that is from behind a th400 IIRC, that'll be 32 spline, ford np205s are 31 spl.

CHOP SHOP · May 5, 2009

I have a 465 mated to a 203. Its very rare and I think GM only did this for one/two years.:awesomework:

karhart77 · May 5, 2009

CHOP SHOP said:
I have a 465 mated to a 203. Its very rare and I think GM only did this for one/two years.:awesomework:

I have one also with a NIB ORD 203/205 adapter that's clocked so the 205 bolts up flat. Cash talks.

WHITE TRASH1 · May 7, 2009

Gramma talk to chevy butcher on tc. He has a 400/203 in running shape for sale. He also has a couple 465/203's as well.

Poohbair · May 7, 2009

CHOP SHOP said:
I have a 465 mated to a 203. Its very rare and I think GM only did this for one/two years.:awesomework:

I believe it was 1974 only...

I wish I knew this about 7 years ago as I threw about 6-8 of them away... :booo:

I blew up a **** load of 4spd/203 cases in my old K5