Transmissions and Drivetrain Need help with your trans? Problems with your axle?

700r4 to th400???

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Old Oct 24, 2017 | 06:01 PM
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From: nc
Car: 91RS
Engine: carb'd 357 vortec
Transmission: 700r4
Axle/Gears: 3.42 posi
700r4 to th400???

I read the sticky. He is doing a lot of things I'm not. I'm working on a 91 rd v6 to 357vortec. Now! With 292 501lift comp. Don't have the money to beef up 700r but have a th400 sitting. I'm sure it can handle motor. This is a weekend toy. Has posi 3.42. Need the answers kinda quick.I know I need custom cut ds and I already have the tranny yoke. Just need part number for cross member good for stock torque arm. And I will have to send back 3000 stall that I bought for 700r. Hey experts please help!!!!!

Last edited by budget builder; Oct 24, 2017 at 06:31 PM.
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Old Oct 24, 2017 | 06:16 PM
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From: nc
Car: 91RS
Engine: carb'd 357 vortec
Transmission: 700r4
Axle/Gears: 3.42 posi
Re: 700r4 to th400???

Forgot to say NO DRAGSTRIP!

Read this somewhere "
On my 1988 I'm useing the 82-83 th-250 (same lenght as 350) driveshaft with my th-400"

Is this possible? Thx

Last edited by budget builder; Oct 24, 2017 at 06:29 PM.
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Old Oct 25, 2017 | 09:39 AM
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From: nc
Car: 91RS
Engine: carb'd 357 vortec
Transmission: 700r4
Axle/Gears: 3.42 posi
Re: 700r4 to th400???

KI found a torque arm relocation kit for the th400 to go in a thirdgen. $259. What else do I need?
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Old Oct 25, 2017 | 11:15 AM
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: 700r4 to th400???

Originally Posted by budget builder
KI found a torque arm relocation kit for the th400 to go in a thirdgen. $259. What else do I need?
I swapped one not long ago in a 1987 Firebird. Used an BMR crossmember with relocation bracket built on it. Had the OEM driveshaft cut down and the correct yoke added.

https://www.bmrsuspension.com/?page=...415&superpro=0
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