Whats the big difference between TH400 and TH350? - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

 
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post #1 of 9 (permalink) Old Jan 3rd, 09, 8:15 PM Thread Starter
Jerrell
 
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Whats the big difference between TH400 and TH350?

I have a big block 402 with a TH350 on it and was wondering if i should buid the TH350 or buy a TH400 and build it. What do you guys think?
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post #2 of 9 (permalink) Old Jan 3rd, 09, 8:17 PM
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Doug Davis
 
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Re: Whats the big difference between TH400 and TH350?

You can pick up a 400 core for under $100. For the extra strength I'd go with the 400.

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post #3 of 9 (permalink) Old Jan 3rd, 09, 8:56 PM
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Re: Whats the big difference between TH400 and TH350?

Depends on how much power you plan on making. I think you can get away with a decent t350 up to about 550 hp. I know we have one in my friends car at 500 hp with a trans brake.

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post #4 of 9 (permalink) Old Jan 3rd, 09, 9:13 PM
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Re: Whats the big difference between TH400 and TH350?

I ran a Coan TH 350 (good sprag) all season last year behind my 461 @ 3450# running 6.80's in the eighth and it never whimpered once. They claimed it would live up to 750 hp.

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Last edited by bigblockwagon; Jan 4th, 09 at 1:08 AM.
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post #5 of 9 (permalink) Old Jan 3rd, 09, 9:18 PM
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Re: Whats the big difference between TH400 and TH350?

A TH400 takes a lot more hp to turn, equalling lower gas mileage and slower timeslips....so unless you've got a lot of hp to spare and don't mind the mileage, better go with a TH350.

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post #6 of 9 (permalink) Old Jan 3rd, 09, 10:21 PM
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Re: Whats the big difference between TH400 and TH350?

Building a bulletproof Turbo 400 will cost you a couple of tenths in the quarter mile. Build a Bulletproof Turbo 350 instead.

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post #7 of 9 (permalink) Old Jan 4th, 09, 12:46 AM
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Re: Whats the big difference between TH400 and TH350?

Quote:
Originally Posted by cobaltchev67 View Post
A TH400 takes a lot more hp to turn, equalling lower gas mileage and slower timeslips....so unless you've got a lot of hp to spare and don't mind the mileage, better go with a TH350.
Got any good evidence of this?
I haven't seen it and I build a lot of transmissions for performance use...
post #8 of 9 (permalink) Old Jan 4th, 09, 2:34 PM
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Re: Whats the big difference between TH400 and TH350?

I like my TH350. Nothing special , has a shift kit in it. Has stood up to 2 seasons of abuse. Th400 are known for being heavy duty, but you already have the TH350. I would not be scared to use it.

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post #9 of 9 (permalink) Old Jan 4th, 09, 5:19 PM
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Mike
 
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Re: Whats the big difference between TH400 and TH350?

hands down put a TH400 in and forget about it!
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