Thanks for the reply. I will probably go with the 31 Spline. And you say I will need new axles, how much they cost?

 

from jegs
ford racing 31 splines are $304.99
from summit
31 spline moser's are $259.95
Alloy usa's are $215.95
Superiors are $279.95

 

Upgrade your vehicle with a 1541-H high grade steel rear axle replacement. High-strength alloy is double heat-treated to produce these heavy-duty axles that are up to 35% stronger over stock.

Stock 28 spline count will make this rear axle upgrade a breeze to install into your 1979 - 1993 Mustang with 4 - lug axles. Axle comes 29" long with a 4 on 4 1/2" press-in bolt pattern.

This product is for the applicable for both the DRIVER and PASSENGER side rear axles of the vehicle.
Please update your cart to two if need a pair.

Alloy USA 10 year "No questions asked" manufacturer's warranty.
You break it; you will get a new one!

Order yours today!

Sold as a single axle.

Price: $ 85.00 / each

drivetrainoutlet.com

 

well I've got 1994 gt convertible and it came with 2.73's whether or not that was commen>?< i dunno? But I just ordered my 3.73's and i was wondering where i order possi traction? or is that the same thing as a limited slip differential?

 

How do you like the 3.73's? I'm thinking of getting some for my 94 GT. But as far as the limited slip, I think they are the same thing.

 

Posi traction is just GM's name for a limited slip diff.