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tranny questions  
86dragvette
New User | Posts: 1 | Joined: 02/07
Posted: 02/03/07
01:38 PM

I am in the process of back-halving an 86 vette. I have a 400 small block built right, 507hp 6500, 530 tq. on motor. Am planning on using some kind of  nitrous plate system in the future. I have a powerglide, and access to a th350. I would like to use the glide but a friend says I wont have the power and will need that third gear. I have not purchased rear gears, but have a 9inch that is already the right width. Any suggestions would be appreciated, spring is coming!
Thanks  


 
oldBogie
Guru | Posts: 1195 | Joined: 08/03
Posted: 03/06/07
09:29 AM

Depends on what youre doing with this car, it's weight and final gear ratio.

The TH350 has an additional (compared to Powerglide) lower first gear. Powerglide is essentially a 2 speed transmission that has (compared to a TH-250/350/400) second and high. The Powerglide is suitable for a competition machine where the vehicle weight is low, the rear gears stiff, and the engine power high to a point where the time it takes to shift 3 or more gears is less effective than the acceleration/speed that can be attained with 2 gears and one or more fewer shifts.

Neither a Powerglide nor the TH-350 will put up with a 500 horsepower/500 ft pounds of torque for long. Either would have to be "built" for these power levels.

Bogie  


 
mighty mouse
New User | Posts: 4 | Joined: 03/07
Posted: 03/13/07
07:55 PM

i spent about 800 on my powerglide to update for drag racing. i run it behind a 700 hp 496 drag luv truck that wieghs 2820 with me in it.
no problems yet. i have see th350 bell housing break in half with a small block right at launch.now i'm talking about drag racing only. it would be wise to use a 400 for the street.  


 
bad_gmc
New User | Posts: 22 | Joined: 08/07
Posted: 11/30/07
09:02 AM

I would use the glide and not the 350. i know too many people that wanted a three speed and went with a 350 instead of a 400. They all broke their 350's. A TH350 will not hold a lot of horsepower especially with nitrous. I believe you would be wasting time and money with a th350.  


 
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