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Had the rear diff oil changed at the dealer a few weeks back. (I know,  bad idea please don't judge me... lol). They did NOT remove the rear cover. They opened the fill plug and pumped out the old fluid and the refilled with the supplied Amsoil.

Yesterday, I changed the rear diff cover to the aFe aluminum cover and added new Amsoil fluid. The auf that was in there for a few weeks didn't look too bad, but didn't want to put it back in. Write up to come on cover install. I did not add any friction modifier.

Yukon Joe

www.RUNRAPTORRUN.com