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

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  #1  
Old Jan 3rd, 09, 7:15 PM
ihatefords ihatefords is offline
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Default 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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  #2  
Old Jan 3rd, 09, 7:17 PM
davis95 davis95 is offline
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Default 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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Old Jan 3rd, 09, 7:56 PM
bracketchev1221 bracketchev1221 is offline
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Default 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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Old Jan 3rd, 09, 8:13 PM
bigblockwagon bigblockwagon is offline
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Default 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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Old Jan 3rd, 09, 8:18 PM
cobaltchev67 cobaltchev67 is offline
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Default 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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Old Jan 3rd, 09, 9:21 PM
Lionel-n-Chevelles Lionel-n-Chevelles is offline
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Default 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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  #7  
Old Jan 3rd, 09, 11:46 PM
jakeshoe jakeshoe is offline
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Default 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...
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Old Jan 4th, 09, 1:34 PM
creeper72 creeper72 is offline
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Default 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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Old Jan 4th, 09, 4:19 PM
71BBB 71BBB is offline
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Default Re: Whats the big difference between TH400 and TH350?

hands down put a TH400 in and forget about it!
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