To my knowledge, all of the traction lock cars are 8.8 (although I think the 7.5 prior to 86 might have also been traction lock). I'm a bit blurry about when the switch was made but gooch is correct about the 87-93. Particularly the GTs. I believe that the 7.5 was used up through 85. The 86+ GTs all had the 8.8.