Best year core for TH400?

[J Banning]

Is there a specific year TH400 core that is desired more than another?

I know I'm looking for a BOP bolt pattern and short tailshaft, but aside from that... what??

Thanks,
-Banning.

 

[CTX-SLPR]

BOP short tails are going to be from 67-72 A-body 2 and 4drs (wagons have a long tail), 67-70 Riviera, 67-70 Buick Fullsized, 67-76 Firebirds with the 400/455, and for whatever reason the 74-76 Pontiac Grand Prix. Best core would be the BB code from the 70-71 Buick GS455 or just about any TH400 from after 1969 as they changed the internals and the filter to the more common stuff. My '64 ST400 is a 1 year weirdy VB and takes the "submarine" filter verus the newer "pancake" filter you can actually get.

 

[jakeshoe]

The odd filter was used until 1967. The good direct drum was used until ~1971, and I have taken some later model units apart that still had them, but they are only an upgrade if you install the 34 element sprag on them.
So a good core would be a 68-71 model IMO.

I have a BOP short shaft core in the shop I can sell or build but you're quite a ways away.

 

[J Banning]

Thanks guys. I really appreciate all the info.

-Banning.

 

[FattyMcTrickle]

BOP short tails are going to be from 67-72 A-body 2 and 4drs (wagons have a long tail), 67-70 Riviera, 67-70 Buick Fullsized, 67-76 Firebirds with the 400/455, and for whatever reason the 74-76 Pontiac Grand Prix. Best core would be the BB code from the 70-71 Buick GS455 or just about any TH400 from after 1969 as they changed the internals and the filter to the more common stuff. My '64 ST400 is a 1 year weirdy VB and takes the "submarine" filter verus the newer "pancake" filter you can actually get.

Do you mean 67-72 Buick A-bodies or would the tranny out of say a 1970 Olds 442 work, because there is one of those around me currently for sale.
And if I got one from a 67 my plans are for a reverse manual valvebody and a trans brake, the differences wouldn't have any effect would they?