70GTO

I'm replacing the 700R4 in my 89 Camaro and was going to go with a TH-350 (I'm not to concerned about gas mileage, I just want to go with a more bullet proof route). One of the guys that i work with told me the TH-400 is a stronger setup? I'm automatic transmission illiterate "as well as with other things", but could someone set the record straight for me please.

Thanks, Bruce

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"Four on the floor, fifth in the glove compartment"

AlkyIROC

The TH400 is stronger than a TH350. It has bigger and stronger internal parts.

The TH400 is also heavier and takes about 15 more HP to turn than the TH350. The TH400 is longer and also uses a different driveshaft yoke. The TH400 has different gear ratios.

A properly built up TH350 can survive just as much as a TH400. My race car still uses a TH350. I've only blown up the intermidiate sprag once. I think I came out of the waterbox wrong when it happened.

You can run quicker ET's with a TH350

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block (times are for the current engine)

Best ET on a time slip: 11.447 altitude corrected to 10.99
Best MPH on a time slip: 119.42 altitude corrected to 124.86
Altitude corrected rear wheel HP: 493
Best 60 foot: 1.586

Racing at 3500 feet elevation with a typical race day over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

70GTO

Thanks Stephen, BTW does the 400 have a higher or lower first gear ratio?

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"Four on the floor, fifth in the glove compartment"

SoCo80p

iTrader: (5)

the TH400 has a little lower first gear, but there pretty close, agian a TH350 will be fine for most everything outside of stright up racing and TH350's can be built to handle it/

70GTO

Thanks man, I really appreciate it.

Bruce

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"Four on the floor, fifth in the glove compartment"

transfixleo

Actually the 350 has a lower first gear than the 400, 2.52 to 2.40 if memory serves me.

AlkyIROC

TH350
first - 2.52
second - 1.52

TH400
first - 2.48
Second - 1.48