How do I determine whether or not my '94 SC with AOD transmission requires the friction modifier in the differential? Is there a tag or stamping on the housing that would indicate whether or not it is a limited-slip unit that would require the friction modifier?
Also, given that I have around 250,000 miles on the vehicle is there a preference as to sticking with conventional gear oil or switching to synthetic? In either case, I have seen differing specifications recommended for the gear oil weight (ie 75/90W, 80/90W, and 75/140W for synthetic).
Would it hurt to use the friction modifier in a non-limited-slip differential?
Thanks,
Ted
Also, given that I have around 250,000 miles on the vehicle is there a preference as to sticking with conventional gear oil or switching to synthetic? In either case, I have seen differing specifications recommended for the gear oil weight (ie 75/90W, 80/90W, and 75/140W for synthetic).
Would it hurt to use the friction modifier in a non-limited-slip differential?
Thanks,
Ted