| Re: Rear Differential fluid change |
Subject: Re: Rear Differential fluid change by CasetheCorvetteman on 2008/3/8 13:52:52 Sucking the fluid out through the filler plug is really quite desperate to say the least, and to me it ranks right up there with dropping $50 worth of engine oil and leaving the dirty old $4 filter in place. The best way to do it is to remove the diff from the car and take the back cover off. And considering how easy this is, its hardly worth doing a half a job of it when for abit more effort you can do it right first go. Standing the unit with the pinion yoke facing the ground, remove the rear cover bolts, then remove the rear end, personally id carefully remove the old sealant BEFORE you drop the oil so anything that falls in will come out with the old oil, and when youre ready, tip the diff up and out comes the oil. Piss easy. Then after you finish cleaning it all up nice and make sure the mating surfaces are looking good, clean them up with turps or metho, get some Permatex Ultra Black (or right stuff) and run a bead around the mating surface of the diff housing, id leave it for a few minutes, then put the cover on. Nip all the bolts up to about 5 ft/lbs in a cross pattern to keep it even, then go to 10 ft/lbs after a few minutes, then 17 ft/lbs, followed by the factory spec for each bolt. Do this procedure with the lower suspension arm bracket bolts in place, or youll be trying to get things even with 4 bolts missing (not to their final spec though, tighten them to the same as the cover bolts nearest to them) Then id leave it to cure for a while. Ive never had mine leak after that. Forget the additive too. Get rid of it. GM no longer use or recomend it, and havent done for a few years that i know of (if they do, they shouldnt be, cause there was a TSB about recomended lubricants for aluminum housed diffs back in 97 or 98 i think). I use and recomend Castrol Synthetic limited slip rear axle lubricant, with a viscosity of 80w-140, and being of an API GL-6 rating, it exceeds the required specs by alot. |
