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What Size rear is the back?

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Old

Apr 3, 2006 | 12:17 AM

#1

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Joined: Apr 2005

Posts: 166

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From: O-K-L-A-H-O-M-A

Car: Trans Am GTA

Engine: 5.7L TPI

Transmission: TH-350

Axle/Gears: 3:23

What Size rear is the back?

I know i have the stock 10 bolt. Im looking at getting some 3.73 gears.

Old

Apr 3, 2006 | 12:26 AM

#2

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Joined: Apr 2001

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From: USA

Car: yy wife, crazy.

Engine: 350, Vortecs, 650DP

Transmission: TH-350

Axle/Gears: 8.5", 3.42

7-1/2"

Old

Apr 3, 2006 | 12:38 AM

#3

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Joined: Jul 1999

Posts: 17,271

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From: 51°N 114°W, 3500'

Car: 87 IROC L98

Engine: 588 Alcohol BBC

Transmission: Powerglide

Axle/Gears: Ford 9"/31 spline spool/4.86

Generic name is a 7-1/2 but technically your 91 will be 7-5/8" They're identical except for the slightly larger ring gear. Parts are all interchangable.

You'll also have 28 spline axles.

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