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Order Locked Thread  TH-350 and TH-400 Automatics  tuffnuff
tuffnuff Moderator | Posts: 7818 | Joined: 12/09 Posted:
11/18/12 11:20 AM  Similarities and differences,,, TH400 was
first implemented in 1965 as GM's first 3 speed trans and saw
production until 1991. It has been installed behind Chevy's,
Caddys, Olds, Buick, Pontiac, GMC, Jaguar, Rolls Royce, and
Ferrari powerplants. IMO it IS the finest production 3 speed
auto ever designed bar none. It works great behind stock
powerplants all the way up to 2000+ HP applications. The TH350
was used from 1969-1986. It had lots of variations and spinoffs.
It is a very underestimated transmission. Though not as strong
as a TH400 it takes plenty of abuse and works well in near stock
form. Used extensivley in GM cars and trucks and shares mounting
location, spline count, and length with most other GM 3 and 4
speed manuals, as well as later Power