th 350 or th 400 for drag racing - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-27-2010, 12:59 PM
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th 350 or th 400 for drag racing

hey! i was wondering what would be better for drag racing, a th 350 or th 400
its gonna be behind a 454 with around 500 hp and 580 ft lbs of tourque

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Old 07-27-2010, 01:42 PM
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if it were me I would opt for the 400. Although you can build a strong 350, the 400 will give you the best protection in racing apps. just my 2 cents.
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Old 07-28-2010, 04:38 PM
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we have been using a built th350 , the 400 steals power ( apx 15 hp ) and some of the cases are prone to cracking in the belhousing area , our trans has lasted 6 seasons in a 3200 pound camaro with 4:88's and a 750 hp motor .
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Old 07-28-2010, 05:01 PM
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If you are looking for best et 3speed most likely will be best. Bracket racing glide all the way. One less shift one less chance for a mistake. I did break a case on a 350 in a mid 10 sec car.
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Old 07-28-2010, 05:57 PM
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It depends on your budget. A 350 turbo can be made to live, but is spendy!!

A 400 turbo can be made to live with little more than a good build, a shift kit and some heavy duty sprags..

Broken bellhousings are seldom the fault of the trans..
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Old 07-28-2010, 08:45 PM
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use the t-400 with 34 element sprag for 2nd gear

IF you use the t-350 trans , you should use a 36 element sprag for 2nd gear.. That would be best for the power level you have and be dependable.

That t-350 drum is very custom built.. about 440.00 dollars

the power loss / use difference between the t-350 and t-400 is too much talk about nothing for what you are doing
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Old 05-25-2011, 08:01 AM
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Invest the money now and go with a powerglide, if you plan on racing for a awhile you will be going this direction sometime, might as well invest the money once on a lighter, less horsepower robbing unit. The th400 is the cheapest to build, but if you use a th400 and you want to switch to a glide later, then the driveshaft will have to redone. Dimmensionally the glide and th350 are the same.

Go with the Glide, they are easier on parts, more consistent.
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Old 05-25-2011, 02:27 PM
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Quote:
Originally Posted by c65shoebox
The th400 is the cheapest to build,
Only because you need less parts for the strength. I had "bulletproof" a spragless 400 built, the cost was $3,600 with a Griner VB and brake. You can spend a pile on a glide as well to get to that level.
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Old 05-25-2011, 04:59 PM
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Big difference between a top sportsman and an average bracket unit. You can do a lot with a glide and $1150.00. That will get you a unit reliable to go into the 9's and handle 950 horse.
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Old 05-27-2011, 09:26 PM
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350/400

it really depends on the weight of the car,i run a glide but im putting out 650 hp.and my car is 2k lbs.if your over 2800lbs with 500 hp a turbo would be a better choice for you.as far as a 350 v/s a 400 with a big block go with the 400 as crosley said do the sprag .
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