Hi. Was wondering if there are differences in valve bodies or other areas concerning 79 caddy and lets say ... 1969 or 71 Buick long tail transmissions ? I’ve heard the earlier bodies are better ? Is this true ? Having a tranny built and have this caddy shirttail at my disposal. Would like to use Buick heavy duty case if I could , but trannies have been out in weather for years so internals could be iffy ! Any help appreciated ! Thx
Calibrations will be different among THM400s. Honestly, I doubt whether it is anything of consequence. I don't think the earlier valve bodies are necessarily better. I would use it, and build it and just beef it up if necessary.
A long tail might imply a big car and engine, like my 472 Cad trans. It in turn might be equipped with a 6 friction direct clutch pack, instead of the usual 5. It could mean somewhat different shift calibration, nothing you can not update. good luck, Bruce Roe
Tranny rebuilt !! Ended up using 69 bc code long tail. Converted. To short tail deep trans pan all new clutches seals etc. B&M shift kit cost was $975 and that’s with parts to convert to shorty deep pan and previously taking apart another 400 core I had that had water and rust in it ! No converter. Didn’t think it was a bad price !Now seeking a 9.5 converter from Jim to finish it off !!
