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-   -   th350/400 engine rpm capability (https://www.racingjunk.com/forums/showthread.php?t=23149)

kicker91laser 02-16-2009 04:34 PM

th350/400 engine rpm capability
 
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 02-16-2009 06:21 PM

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 02-16-2009 06:24 PM

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

shawnp 02-17-2009 06:22 PM

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 02-18-2009 10:12 AM

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 02-25-2009 01:00 AM

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 03-20-2009 03:34 AM

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 08-24-2009 01:30 AM


Originally Posted by 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.

CamBirdRacing 08-25-2009 12:01 PM


Originally Posted by mreese

Originally Posted by 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 08-28-2009 08:00 AM

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


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