Stock Rear End?

[dcurtis]

I got my mustang yesterday and was wondering what type of differential is in it, it is a 91 Gt with the auto tranny, I think the gears are 2.73 but is it limited slip or an open diff????

 

[mustanghrspower]

Does the rear end have an ID tag on one of the cover bolts? This tag will have the gear ratio and an L if it is a locker. I have yet to see a Mustang that came from the factory with a 5.0 from 86 on that doesn't have a locker though. Sometimes they're so worn out you might think it is an open rear though.

 

[SVT32VDOHC]

Does the rear end have an ID tag on one of the cover bolts? This tag will have the gear ratio and an L if it is a locker. I have yet to see a Mustang that came from the factory with a 5.0 from 86 on that doesn't have a locker though. Sometimes they're so worn out you might think it is an open rear though.

+1. Some diffs are already burnt up and they are only a one legged warrior. Check the tag...like stated above.

 

[HISSIN50]

+2. All aero GT's had Trac Lok.

 

[4G-KDMP]

+2. All aero GT's had Trac Lok.

x2

 

[f4fntm]

I'm gonna take it one step further and say: Fox GTs in all years came standard w/a Traction-Lok rear, except in 1982. That includes the '83-'84 Turbo GTs.

1991 gearing is either 2.73 or the optional 3.27.

All this per the Mustang 5.0 Technical Reference & Performance Handbook.

 

[dcurtis]

It does have a tag on it but there is no 'L' on it, I'm not positive but it doesn't look like the factory unit though, I will just have to pull the cover I guess, Is there any way to make it work again if it does have the locker in it, if it doesn't does anyone know a good place to get one for a descent price, I will probably go ahead and pick up some new gears while I'm at it, either some 3.42's or 3.73's, anyway thanks for the help.

 

[f4fntm]

Take it to a diff shop and have it rebuilt. Specify that it's for a performance application and ask what they can do to make it a bit stouter.