I am getting ready to change out the differential gear oil in my Dodge Ram 1500 4x4 with 3:92 gears and it is an anti spin (POSI) rear end. It calls for synthetic gear oil. I am thinking about using Valvoline synthetic gear oil. Is this a good gear oil for the money? I do not abuse the truck in any fashion. I don't mud it or even tow allot with it. I has 60,800 miles on it right now. Just bought it and trying to service it as I want it to last a long time. Any recommendations would be appreciated. Thank You