I just got a Eaton Truetrac diff installed in my rear end and the shop that installed used this http://www.valvoline.com/our-products/grease-gear-oil/high-performance-gear-oil gear oil. On a Truetrac you are not supposed to run synthetic or anything with friction modifier. I saw on the bottle it say "limited slip" which made me wonder if it had some sort of friction modifier in it. Does anyone know if this is just regular gear oil or if it has something in it that would make it less than Ideal for my Truetrac.
