I need to know if there is a way to look at a diff and tell if it is out of a turbo II or N/A.

 

the whole pumpkin or just the diff itself?

 

the whole pumpkin. It is still in a car and the guys says that it is out of a turbo II but I want to make sure.

 

Tii rear ends = 8"

N/a rear ends are 7"

The case for the tii will be bigger than an n/a. Take a picture, it might help.

 

i have heard the ring is bigger so i figred the case would be larger. Is that the only way to tell?

 

You could also bring a TII halfshaft along when you look at the LSD. If the TII halfshaft fits, then it is a TII LSD. If the TII halfshaft bolt pattern is just slightly too big, then it is a NA LSD.

Also, keep in mind that nearly every S4 LSD needs rebuilding nowadays if it still has the original clutch parts. The clutch parts alone are about $600, or you can buy new aftermarket replacement units for about $1,000. Many of the S5 LSDs still function, but they are not rebuildable once they wear out, although you can replace the internals with aftermarket components just like the S4.

 

Turbo II diffs had 11 ribs on he back and N/A lsds had 9 ribs, among other differences.