I changed mine on my 97 right before I traded it off. It takes 2 bottles (liters) of the synthetic. Also there is an additive for positive traction, if you have it. Any semi competent sales clert at Autozone should be able to assist you on this one. Problem is refilling the differential after you drain it. The fill plug is on the passengers's side rear toward the upper part of the housing. Real pain in the ass to get to. Might want to think about dropping the drive line to get to it. I didn't and I think I got more fluid on me than in the differential. Best of luck.