Still loving my Truetrac as well. I still have the original Valvoline non-syn 85w-140 in it, and only occasionally hear any noise from the diff. I did realize that Valvoline sneak friction modifier in there without saying so on the bottle. A-holes. I'm going to make an attempt at running the fluid I really want to run, Amsoil Severe Gear 75w-140, and hope the Truetrac like it!