th350/400 engine rpm capability

Old 02-16-2009, 04:34 PM
  #1  
kicker91laser
Member
MASTER JOURNEYMAN
Thread Starter
 
Join Date: Oct 2008
Location: Desoto, MO
Posts: 37
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.
kicker91laser is offline  
Old 02-16-2009, 06:21 PM
  #2  
TheYellaBrick
Senior Member
RACING JUNKIE
 
TheYellaBrick's Avatar
 
Join Date: Mar 2008
Location: Emmett, Idaho
Posts: 7,334
Default

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
TheYellaBrick is offline  
Old 02-16-2009, 06:24 PM
  #3  
kicker91laser
Member
MASTER JOURNEYMAN
Thread Starter
 
Join Date: Oct 2008
Location: Desoto, MO
Posts: 37
Default

Hard acc for a short time, wouldn't be taking it that high all of the time, esp on the street.
kicker91laser is offline  
Old 02-17-2009, 06:22 PM
  #4  
shawnp
Senior Member
RACING JUNKIE
 
Join Date: Mar 2003
Location: Ohio
Posts: 936
Default

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.
shawnp is offline  
Old 02-18-2009, 10:12 AM
  #5  
desoto30
Member
JUNIOR BUILDER
 
Join Date: Feb 2008
Location: Childers Australia
Posts: 98
Default

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.
desoto30 is offline  
Old 02-25-2009, 01:00 AM
  #6  
chevyfireball
Senior Member
MASTER BUILDER
 
Join Date: Dec 2005
Location: Napier, New Zealand
Posts: 231
Default

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.
chevyfireball is offline  
Old 03-20-2009, 03:34 AM
  #7  
CamBirdRacing
Senior Member
DYNO OPERATOR
 
Join Date: Feb 2009
Posts: 510
Default

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.
CamBirdRacing is offline  
Old 08-24-2009, 01:30 AM
  #8  
mreese
Junior Member
SHOW GUEST
 
Join Date: Jul 2005
Posts: 3
Default

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.
mreese is offline  
Old 08-25-2009, 12:01 PM
  #9  
CamBirdRacing
Senior Member
DYNO OPERATOR
 
Join Date: Feb 2009
Posts: 510
Default

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.
CamBirdRacing is offline  
Old 08-28-2009, 08:00 AM
  #10  
russ67chevelle
Senior Member
EXPERT BUILDER
 
Join Date: Jan 2005
Posts: 336
Default

i agree FIND A DIFFERENT BUIDLER!!!!!!!!
russ67chevelle is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -