I just put royal purple gear lube in the rearend on my truck. According to the bottle it says that it has a limited slip additive already in the lube. Do you guys normally add an more limited slip lube to the royal purple or just go with whats in the bottle? Also how High should the lube be in the rear end?

Thanks

 

always put the friction moddifier in even if the bottle says it has it already....fluid should be just slightly below the plug hole, just usually just fill er up until fluid starts to come out the plug hole and put the plug back in