I have an 88 manual convertible. I also have a 87 turbo rear end. I was wondering if I could use the turbo 4.1 and the lsd in my NA differential housing.

 

Nope, the TII LSD is too big to fit into the N/A housing. Is there any reason why you want to switch to the turbo stuff? The only reason I could see for the swap is having a 3.9 diff, and if that is the case, just go into the forsale section and buy a 4.1 or a 4.3 that is made for the N/A housing, maybe even a GXL diff that has a LSD.