So i was thinking about changing both differential, (front is open and the rear is a limited slip), transfer case and transmission oil in the HDJ81 and was wondering what i should use? so what are you using?
Regular gear oil for the difs and Tcase (plus LSD additive for the rear), as per the FSM specs. And, I will be filling the tranny with synthetic gear oil as I am tired of a notchy box when its really cold.
After some reading and research, I bought a case of Red Line gear oil a few months ago.. I just need to haul my lazy bum and do the change. Red Line Oil: Gear Lubricants
I picked it just as the Looine was on its way down so, I got it for 12 C$ a quart. Don't know how much it is selling for now.. According to the capacities in the manual, you will need ~ 7.5 Liters to do all your drive train. Here's what I compiled from the manual: