ok,i've got a 12bolt out of a 74 1/2 ton kinda a budget rebuild,new seals ,crush sleave and the guy had to make a shim to get everything right.anyway time for lube.anybody know roughly how much one of these holds? are we talking 85w-140w?or?????i've saw royal purple and also slick 50 gear lube any benifits to these? thanks guys...........dave