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

Cost to beefup a 700R4?

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Old May 10, 2001 | 08:33 AM
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Changa2's Avatar
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From: Muskegon, MI
Cost to beefup a 700R4?

Approximately what would it cost to beef up a TH-700-R4 (Pre 1987) for a 383 with 400-425HP, including a shift kit?
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Old May 10, 2001 | 03:14 PM
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From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
$1000-1500, depending on the skill level of the shop.

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Old May 10, 2001 | 08:13 PM
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From: Savannah, GA
Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer
$500-800 if you do it yourself.

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Old May 11, 2001 | 07:08 AM
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From: PA
Car: 88 Firebird WS6
Engine: 350 TPI
Transmission: T56
Axle/Gears: 3.42
You can't really 'beef up' the earlier ones because they had drawbacks like softer planetarys, smaller sprags....

It's best to start with the later one, but you might as well see if your trans could hold together while you save up/scope one out.

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