I'm surprised to. I think it's all about what lube you run in them, and of coarse proper shimming. I know there are those that disagree with this, but I think grease and thinner diff oil, is much kinder to the gears than diff
locking oil. Issue with thinner oil is it sneaks past the o-rings quicker. However, diff oil is a necessity if you need to tune your truck for racing or partially lock your diffs for climbing.
Grease is a win win for me because it keeps the gears happy and doesn't leak out. I'm curious how the STP stuff will work out . . . who knows, I might even like it better.
