Technical Tips > Transmissions - Differentials

Differences in auto gearboxes

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Adam:
Ok, Iv'e got a turbo 350 gearbox, I've also heard of turbo 400's and even 700. Whats the diff? Are the numbers the amout of horsepower they can handle?

Adam

77CVT:
Is this what you're after?
TH350
1st – 2.52
2nd – 1.52
3rd – 1.00
Rev – 1.93

TH400
1st – 2.48
2nd – 1.48
3rd – 1.00
Rev – 2.00

TH700-R4
1st – 3.06
2nd – 1.62
3rd – 1.00
4th – 0.70
Rev – 2.29

Here’s a link for g’box ratio’s. http://www.2quicknovas.com/tranny.html

The TH400 superseded the TH350.  It is a stronger box but not as well geared as the TH350.  The TH700 is the overdrive box that is used in a lot of our cars (Commodores) and has a stump puller 1st gear.  A good mod for a Corvette!

rebel:
Note also that some '80 'vettes and Camaro's with the 350c (mx3) auto's, can experience a momentary delay in drive resulting from loss of front pump prime. GM corrected this from production runs of Feb '81.

Brutus:

--- Quote ---Originally posted by 77CVT
 The TH700 is the overdrive box that is used in a lot of our cars (Commodores) and has a stump puller 1st gear.  A good mod for a Corvette!
--- End quote ---


Either this or the 200R is planned for mine when the engine comes out. That low first gear plus the 3.7s I just installed should make for some interesting takes offs to say the least.:22

77CVT:
Brutus

Are you getting one over from the States or can the 200R be sourced locally?  If you're getting one from the states, wouldn't it be cheaper to use one out of a VN Commodore?

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