Here's what I know from listening and reading the microfiche:
85-86 have std LSD, no ABS
87-88 have ABS (some don't) and therefore no LSD
89 "should" have ABS and Torsen LSD
I intend on changing my 86, with no ABS or wiz-bang steering (less to
fail) from std. LSD to Torsen (if the 89 really has Torsen, I have an 89
parts car with not much left but the rear-end!).
I think Torsen and no ABS or fancy stuff is a good combination from both a
driving and $$ POV.
-Jim