I have a 94 Mustang GT Conv. What's the difference between the 28 and 31 Spline Differentials? I'm looking to have some drive train work done. Installing limited slip differential, new clutches and 3.73gears. I'm hearing grinding noise in the rear end when I come off the clutch and I have 20" rims on her. I read it was better to replace stock the gears anddifferential. If anyone has recommendations, please share. One more question, are the stock gears 8.8"?

 

8.8 is the size of your rear end. stock gears are 3:27

 

Thanks bro...

 

31 spline axles are stronger than 28 spline and you need a 31 spline diff to run the axles. I went with the '03 Cobra diff and moser axles for my setup, so far so good.

 

If you stay with 28 you can use the stock axles and dif just put new clutchs in it. If you go 31 you got to buy a new dif and axles.

 

Actually I'm fairly certain that the '94s onlycame with either 2.73s or 3.08s. For manual at least, I'm not too sure on autos. Feel free to correct me if I'm wrong though.

 

do they not make upgraded strenght 28's?

 

The GTs were 3.08 and I think 2.73 gears. Cobras were 3.27s

 

Cobras only had 3.08s that year also.

 

depends on the year, though.