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Old 12-04-2006, 12:57 PM
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Trans for 500+ HP SBC in a 3500 lb car

Just wanting to make sure I have transmission facts down before I spend a pile of cash on a new transmission....

Looking for a trans for 500+ HP SBC in a 3500 lb car....

powerglides are better suited for cars under 3000 lbs...

TH-350 are good up to 450 HP....

so my choice should be a TH-400...right or ...?

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Old 12-04-2006, 01:24 PM
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A good TH350 will work behind a whole lot more power than 450. We have a Nova running 9.80's @ 135+ with a relatively mild TH350.
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Old 12-04-2006, 04:14 PM
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Ive got a 350 in my drag car at 520 hp and it holds up fine. Has a trans brake and a couple after market parts but still basically stock.
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Old 12-04-2006, 07:22 PM
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thanks for the replies....

are these off the shelf name brand units...if so what are using??? or are they something you have built....
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Old 12-04-2006, 07:29 PM
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Quote:
Originally Posted by onovakind67
A good TH350 will work behind a whole lot more power than 450. We have a Nova running 9.80's @ 135+ with a relatively mild TH350.
Quote:
Originally Posted by swvalcon
Ive got a 350 in my drag car at 520 hp and it holds up fine. Has a trans brake and a couple after market parts but still basically stock.
But both these cars are less than 3500 pounds I bet ...
I would use a 400 Turbo and be sure ...
When it doubt ... make it stout ...


Deuce ...
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Old 12-04-2006, 08:04 PM
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Trans for 500+ hp in a 3500 LB car

Street car,or race car,or both. We have run thm 350"s behind big blocks with good results. The 400's,well everybody knows how tough they are.

If this is a race application,check out Jhon Kilgore transmissions. His th400 reduces 30LBs of rotating mass.
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Old 12-04-2006, 08:16 PM
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KIlgore's trans is intended for class racers (Stock, Super Stock, Comp) not bracket cars. It is an excellent trans, but I doubt he is looking for a $6000 bill.

Nastynova; Use the T350. Use a GOOD valve body (manual, either forward or reverse) and ask the manufacturer about other mods they would recommend. I have several ideas...
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Old 12-04-2006, 08:22 PM
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trans rear-end question

I have a 36 Chevy panel with a blown 468 which is right at 800 HP....Never weighed it but it's probably less than 3500 lbs.
I run a turbo 400 with a 2800 stall converter, with a Ford 9".
No problems of any type.
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Old 12-04-2006, 08:33 PM
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Rossler builds a nice t-400..... about 5500.00 IIRC
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Old 12-04-2006, 08:37 PM
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I have had customers run TH350's at over 600 HP in 3600 lb cars without issue.

Build it right and it will hold up fine.
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Old 12-04-2006, 08:47 PM
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I have a fairly healthy 350 with a small blower in my K5 Blazer. The T350 is stock except for a B&M Shift Improver and 2400 RPM converter. It's a 4500lb 4x4 and the tranny has held up just fine for almost a year now.

Last edited by Blazin72; 12-04-2006 at 08:52 PM.
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Old 12-05-2006, 11:08 AM
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My 350 worked great untill my tire hooked on a 95 deg day.
Then the stock sprag broke. Get a hardened sprag or better yet a 34 tooth. The 34 tooth is alot more money.Now I have a 400.
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