so i just got an 85 just the basic s model, it has drum brakes in the rear but it deffinantly spins both tires all the time, it does excellent 360s and brake stand and everything, like it has posi. i havent checked yet but i will soon, was there ever a limited slip put in the rear end with drum brakes?

 

Pretty sure only the GSL-SE got the LSD. Someone may have swapped.