After going over the LO I'm still confused about the differential additive. It says use the additive in the front but not the rear. Dosen't my truck have lockers in both ends? I have the dullay w/the dana 70 rear. Is it the same additive for the D60, D70 & 14 bolt or is it axle specific. Sorry for showing my ignorance but I've only had the truck a few months. I'm going through everything & the rear diff cover is leaking so I'm going to do new fluid front & rear.