Turbo II rear end?
 

How can I tell if a rear end is from a turbo II or not? I have found a rear end for my swap that is LSD and fits 89-91, but they don't know if it came from a turbo or not. Are there any numbers I can check or identifying marks? Thanks.

Measure the bolt configuration on the pinion flage. The turbo is larger.

If you look at pictures long enough and are very observant, you can see details in the pumpkin (from behind) that will differ between the two. There are some very small details you must key in on.