th350/400 engine rpm capability

[kicker91laser]

What can these transmissions take as far as engine speed goes? I will be putting a th350 behind an engine that will be capable of revving to 8.5k+ and just want to know if they will survive at engine speeds that high. Thanks guys.

[TheYellaBrick]

How long a time at that rpm ?

Drag ? Hard acceleration for short time

Mile ? Hard acceleration for 1 mile

Road race track ? Hard acceleration / decceleration - up / down shifting

Open road race(endurance) ? High speed for extended time

[kicker91laser]

Hard acc for a short time, wouldn't be taking it that high all of the time, esp on the street.

[shawnp]

It is just not about engine RPM. Personally, if it is a heavier street/strip car, I would pass on the 350 and go for a 400 that has been built to maintain your application. Don't get me wrong, a 350 serves the purpose, but a 400 will take more abuse.

[desoto30]

I used to have an engine that was turned in excess of 9k with a T400 behind it for a few years.It seemed ok,the trans I felt didn't seem to require an extraordinary amount of maintainance.

[chevyfireball]

If you're building the car for drag racing - get a TH400 and rebuild it with drag parts. A standard TH350 or even a TH400 won't handle hard out drag racing for too long.

[CamBirdRacing]

I have been rcaing with my th400 since 96 and have had it rebuilt only once. It's behind a 455 Pontiac. My brother has a 72 Nova with a 406 and he goes thru 3 th400 a year. They don't like HIGH rpm's. 6500 max on a th400.

[mreese]

I have been rcaing with my th400 since 96 and have had it rebuilt only once. It's behind a 455 Pontiac. My brother has a 72 Nova with a 406 and he goes thru 3 th400 a year. They don't like HIGH rpm's. 6500 max on a th400.
if that's all it can handle you better junk it or find a better builder.

[CamBirdRacing]

I have been rcaing with my th400 since 96 and have had it rebuilt only once. It's behind a 455 Pontiac. My brother has a 72 Nova with a 406 and he goes thru 3 th400 a year. They don't like HIGH rpm's. 6500 max on a th400.
if that's all it can handle you better junk it or find a better builder.


I keep telling him to put a p/g in it. Some people just won'tl isten.

[russ67chevelle]

i agree FIND A DIFFERENT BUIDLER!!!!!!!!