I'm getting ready to change the front and rear diff oil to synthetic, and was wondering which is the best for an 06 Rubicon? Also have an 02 sport with Dan 44 rear 3.73s. Would this need the same as the Rubicon? Do these diffs use gaskets, o-rings, or RTV?
Amsoil Severe Gear. They make 3 weights. For your application, 75-90 for normal service in both rears. If you tow, 75-140 in you back axle.
You can use RTV, or gaskets. I personally like the Lubelocker gaskets, just make sure you follow their instructions for torque of the bolts that hold the cover on, use a little Blue (medium strength) Locktite on each bolt. That will prevent the bolts from loosening and the cover from leaking.
I have redline 75-140 in my rear. You dont use your front diff as often so you might just want to leave regular gear oil in there. If you drive through water then you should just stay with gearoil front and back. Costs to much money to change out everytime you submerse your axles.
the book calls for synthetic in the Rubi axles, anyone know why? am I wrong to assume it may have something to do with the axle locking mechanisms, perhaps it helps them lock/unlock quicker. anyone run reg gear lube in them, if so how did they (lockers)do?