Mine are both american spec supras ones an 85 the other an 84 i haven't attempted to drive the 84 in awhile, well with the engine out but i always thought that with limited slip when you turn the wheels with the rear wheels off the ground that they should both move the same way, and if its not the other wheel will rotate backwards well in my 85 the other wheel just sits there like duh, what do i do...and this winter i kinda got stuck in some ice and only one wheel would turn? I dunno maybe the rear end is slowly going out.