Join Date: Jan 2002
Location: Chapel Hill, NC
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Re: Gonna change diff covers..... tips?
1) don't worry about the fill plugs...The way to drain the diff is to put a large pan under it and start pulling the cover bolts off. You will likely get them all off before you see any oil...I usually have to pry my covers off. I leave a top bolt in, but loose, just to hold the cover up in the air, and let the diff drain into the pan of a while.
2) I swab out the diff with a rag as best I can. But I don't make too much of a deal of it. If your diff fluid is really dirty or green or milky, you can get fancy and pull the axle shafts and spray some brake cleaner in from either side...cleaning the tubes out, then spray down the housing and the carrier real good, swab it out then let all the brake cleaner dry out.
3) I always use RTV sealant instead of the paper gasket, so I have to scrape mine down with a razor blade, I use a widow scraper. Then I spray some brake fluid on a rag and wipe down the mating surface of the diff. Let it dry. Then run a bead of sealant around the edge (making sure to go to the inside edge at the bolt holes). Then apply the cover using an upper bolt as a guide. I then let it sit overnight to let the sealant cure.
4) If your diffs are still sitting level (not pointing at the t-case, using a CV drive shaft) Fill to the hole in the cover. Make sure your new bling covers have the hole in the same place as your original stock cover. I use Amsoil 75w90 in my D30 and F8.8. Dino 90w will do just fine.