btw no late 80s 240s...well 89 but i consider that 90s lol.

for s13s you will likely have to check for superhicas in the rear. abs doesnt mean jack shit in s13s but likely they had all 3 of those paired.

s14s only had lsd if there was abs (or if it was a modded car, someone might have installed it themselves as an add-on).

also look on the differential itself. might have an orange tag.