I had Jiffy Lube change the rear differential fluid. I had never experienced any problems with my rear diff before they did the service. I took my truck to my mechanic for new shocks and had them investigate a whining noise coming from the rear of the truck. The mechanic investigated and asked if I had work done on the rear diff recently and I told them I just had the fluid changed. He suggested that Jiffy Lube had not put in the differential additive. I called JL and they checked the invoice and realized they had not put the additive in and drove the additive over to the shop to have it added to the rear diff fluid. This arrangement was documented by my mechanic in their invoice. JL also reimbursed me for the money spent to diagnose the problem. A few weeks later I started noticing subtle noises coming from the rear that have gotten worse. I now have my truck in the shop as the rear diff is chattering pretty bad at times and needs to be replaced. I have initiated conversation with the district manager of Jiffy Lube who has told me to again get a diagnosis on the Differential. I have noticed some finger pointing coming from JL and am fearing they are not going to take responsibility for this.
Question of the day: What steps should I take to keep from getting screwed? How strong of a case do you think I would have in small claims court if need be? What documentation is their out there supporting the lack of rear Diff additive being detrimental to the differential itself? Thanks for your help!