I have a 1991 dodge power ram 150 4x4 truck. I wanted to use 1 grease for everything on this truck and I ended up choosing valvoline synpower grease. Now over the last couple years I have trashed u-joints on my rear driveshaft left and right. Person at the driveline shop dpsaid it could be from my 4 inch suspension lift kit. So I had a friend check out the angle of my driveshaft and he said it looks fine to me, he said I don't see any steep angles that would cause a u-joint to fail early. So now I have been wondering, is it the grease I have been using? Valvoline synpower grease says its moly fortified and I have heard a lot of ppl say no moly in u-joints. Could this be what's going on?