808olds

Anyone ever use a bell housing adapter to fit a chevy th-400 to a olds 455? I live in hawaii and i haven't had any luck finding a BOP trans . chevys are everywhere. I do have 2 BOP th-350 that i may send out to a shop .Not sure which way to go . I have heard that the 350 can be built up to handle the 455 Tq but still undecided. My 455 should make about 450hp and 500ft/lbs .

Olds64

I've never used one of those adapters but I haven't heard anything bad about them. If you put an adapter on your engine why don't you get a 700R4 isntead of a TH 400?

808olds

never really thought about that option

Redog

I heard of people using them with no problems

Olds64

Just an idea.

808olds

Cool thanks for the ideas. I actually found a 400 core like a day later .I guess im going with that.

Rickman48

Hope it has the tail shaft, like you need!
Can't imagine shortening a shaft in Hawii -
I've used that adapter the other way - Olds to Chev. - not a problem w/400 RWHP either!

808olds

how can i tell the difference?

Rickman48

The tailshaft is the last housing on the transmission that also holds the speedometer gears.
'A' body cars, [cutlass, chevelle, special, lemans] use a 'short shaft', about 8 inches long.
On big cars it's about 14 inches long, requiring shortening the driveshaft a like amount, and can be expensive!
Chevrolet came out with a 4L80E a while back which is essentially a 400 w/ O.D.!
Don't know the measurements, but would hold your TQ + HP, although you'd need some electronic hook-ups, and that adapter, possibly a D/S shortening, too!
Never been out there, but are there X-ways?? Where can you go over 65 and for how long? O/D might not be worth it - unless you're pulling steep gears!
Measure the current trans from the front of the bellhousing, where it meets the block to the end of the tailshaft, and find one the same length to avoid driveshaft shortening!
Good luck -

64Rocket

Pretty much 45 miles per hour all over. The big Island 55 miles per hour was the most I saw. Maui and O'ahu is 45 miles per hour and not to much room for a freeway.

Gene

Rickman48

Guess an O/D wouldn't be worth the hassle then - it'd never get used!