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Old 11-09-2008, 10:11 PM   #1
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Join Date: Dec 2007
Location: Portland Maine
Posts: 55
Car: 1991 Trans Am GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Stock 3.23 posi

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1991 GTA 10 bolt identification (with a problem!)
So I have a 1991 trans am gta. It has the l98/ 700r4 combo with a 10 bolt posi rear end.

The rpo codes are:
GU5 (3.23 ratio) and
G80 (positraction lsd)

Heres the problem

I need to find a rebuild kit for it but I don't know how to identify it. I have looked on the axle tubes and found no stampings, there is also no tag on the pumpkin bolts.

I am assuming the rear is stock because it does not look like anything has been tampered with under there (only 70k on the clock so no reason to either...)

So does anyone know the stock specs for this car or a rebuild kit that will work for it?

Or you can give me suggestions on how to find out what rear-end it is.
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Old 11-09-2008, 10:17 PM   #2
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Join Date: Aug 2006
Location: Central NJ
Posts: 10,299
Car: 86 Trans Am, 92 Firebird
Engine: 408 sbc, 3.1L of raw power
Transmission: TKO600, 700r4
Axle/Gears: Moser 9", 3:70 trutac, open 3:23

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Re: 1991 GTA 10 bolt identification (with a problem!)
its a 7.5/7.625 a rebuild kit for that would work just fine. It would probably just be bearings and a cover gasket.
is that what your looking for? or a rebuild kit for the posi?
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Old 11-09-2008, 11:04 PM   #3
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Join Date: Dec 2007
Location: Portland Maine
Posts: 55
Car: 1991 Trans Am GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Stock 3.23 posi

Classifieds Rating: (0)
Re: 1991 GTA 10 bolt identification (with a problem!)
The pinion bearing/seal is gone so I figured I'd do all the bearings while I was there.

how do I know if it is 7.5 or 7.625? just take the cover off and measure?

EDIT: and I may do 3.73 gears while im in there too
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Old 11-09-2008, 11:52 PM   #4
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Join Date: Jul 1999
Location: 51°N 114°W, 3500'
Posts: 13,970
Car: 87 IROC L98
Engine: 582 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86

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Re: 1991 GTA 10 bolt identification (with a problem!)
7.5 and 7.625 10 bolts are the same. The only difference is the slightly larger ring gear. Everything else including the carrier (posi) is the same between the 2 diffs.

7.625 started around 1986 so your 91 will be a 7-5/8 but to most people, it's still called a 7-1/2" diff.

Your 91 will also have 28 spline axles.
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Old 11-10-2008, 07:47 AM   #5
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Join Date: Dec 2007
Location: Portland Maine
Posts: 55
Car: 1991 Trans Am GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Stock 3.23 posi

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Re: 1991 GTA 10 bolt identification (with a problem!)
Quote:
Originally Posted by Stephen 87 IROC View Post
7.5 and 7.625 10 bolts are the same. The only difference is the slightly larger ring gear. Everything else including the carrier (posi) is the same between the 2 diffs.

7.625 started around 1986 so your 91 will be a 7-5/8 but to most people, it's still called a 7-1/2" diff.

Your 91 will also have 28 spline axles.
Thanks for your help. Thats all i needed to figure out.
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Old 11-10-2008, 07:47 AM
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