th350/400 engine rpm capability

Old 02-16-2009, 05:34 PM
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kicker91laser
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Default 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.
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Old 02-16-2009, 07:21 PM
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TheYellaBrick
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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
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Old 02-16-2009, 07:24 PM
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kicker91laser
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Hard acc for a short time, wouldn't be taking it that high all of the time, esp on the street.
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Old 02-17-2009, 07:22 PM
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shawnp
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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.
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Old 02-18-2009, 11:12 AM
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desoto30
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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.
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Old 02-25-2009, 02:00 AM
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chevyfireball
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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.
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Old 03-20-2009, 04:34 AM
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CamBirdRacing
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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.
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Old 08-24-2009, 02:30 AM
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mreese
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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.
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Old 08-25-2009, 01:01 PM
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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.
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Old 08-28-2009, 09:00 AM
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russ67chevelle
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i agree FIND A DIFFERENT BUIDLER!!!!!!!!
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