TH350 vs. TH400

[jimijam00]

Originally Posted by Accelo

GM put the 400's behind the 2 Wheel drives big blocks.

I'm not the only 69 2wd around here that came with a 350ci and a TH400. It wasn't very common it seems, but it did happen.

[FirstOwner69]

Originally Posted by jimijam00

I'm not the only 69 2wd around here that came with a 350ci and a TH400. It wasn't very common it seems, but it did happen.

My '69 2wd 3/4 ton with 350 engine also has a TH400.

I think I read in a post on this forum a few years ago that the TH350 was used in all 2wd SBC trucks starting in 1970 or 1971. Not sure about big blocks.

[Mike C]

TurboHydromatic was an option, but TH350 or TH400 was not. GM chose which trans to put in the truck based on whatever metrics they may have had in place. 1969 was the first year for the TH350 and maybe it was unproven in the 3/4 ton arena and that’s why they used 400’s commonly that year.

I also have a ‘69 3/4 ton pickup with a 2 barrel 350 and the TH400 installed. My ‘72 350 4 bbl 3/4 ton Suburban has a 350. The ‘71 1/2 ton big block has a TH400 because big block.

I have a junky ‘69 Jeep J3000 pickup that has the GM sourced Buick 350 and a TH400 attached to the Dana 20 t-case, all factory for that application so GM could of had they wanted or felt the need.