My factory rear is a limited slip 2.73 drum rear. I am taking the 3.55 gears, carrier, and posi out of a "88 GTA disc rear. How many splines does the Trans Am's rear have. Can I use it in my rear(b/c I think I have 28 splines)

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92 Camaro RS
305 TBI
T-Tops
DynoMax Cat-Back Exhaust
Gutted Cat
Hypertech Street Runner Chip
Custom K&N open element cold air intake
Custom Interior
Window Tint

JVC El-Kameleon Head Unit
Pyramid 6 x 9's
Jensen 5 1/4's
2- 10" Kenwood Tornado Subs
Pyramid 600 Watt Amp
Best ET: 15.976 @ 86.01 mph
reaction time: 0.479
60 ft: 2.269

 

The 88 GTA doesn't have a 3.55. It has either a 2.77, 3.27.or 3.45. It's a Borg-Warner 9-bolt; yours is a Saginaw (GM) 10-bolt. Absolutely nothing internal interchanges.

You are however correct, your existing one has 28 splines.

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"So many Mustangs, so little time..."
ICON Motorsports

 

The GTA rear is my friends that I buying. He told me it is a GM- 10 bolt with a 3.55 posi. Where are the numbers on the rear, so i can run them to see how many splines it has?

 

should be a tag on one of the bolts on the diff. cover...