350 TH Trans.
Race Director
Joined: Oct 2008
Posts: 19,220
Likes: 1,671
From: Long Island
Last time I inquired with a builder of trans, I was told : 400 is larger and has more HP loss, but can be built stronger than a 350. I did not go with the automatic so I have no real life experience..
With todays new developments I would think they can be about equally as strong.
With todays new developments I would think they can be about equally as strong.
Le Mans Master
Joined: Nov 2016
Posts: 9,256
Likes: 949
From: Lake Tahoe, CA
Le Mans Master
Joined: Nov 2016
Posts: 9,256
Likes: 949
From: Lake Tahoe, CA
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
The 400 is way stronger than the 350-- even built using good parts. But it's also a bunch heavier. That said, some years ago I built a TH350 for a guy that was running a 455 in a 66 GTO with slicks and 4.11 gears. He broke everything but the trans.
Burning Brakes
Joined: Aug 2013
Posts: 1,071
Likes: 322
From: palm springs ca
When I worked at Chevy they sent a few of us to the new TH350 trans school. Then the TH400 came out behind the BB cars and in trucks. When asked if we had to go to TH400 school, the service manager said " no use, they dont break down, to strong".
Dom
Dom
Race Director
Joined: Jan 2000
Posts: 13,018
Likes: 2,262
From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
Big difference in strength between the two. But if HP isn't insane a T350 is an excellent trans and can be built to shift fantastic.
JIM
JIM
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski