This may be a silly question, but can someone post a pic or manual link for changing diff fluid. I looked underneath and couldn't determine where the drain was and the fill was. Rather than going nuts over it, I thought I'd ask.
Are you talking the rear diff? Easy peasy. The plug (if you're so inclined) is just a rubber fill cap on the diff cover (rear) about 1/2 way up the cover housing. If your diff is clean, it's easy to see.
For front diff, cover removal is impossible without a small army ASE certified mechanics and machines that go *PING!*. So use drain plug near bottom.
But for rear diff:
The quick and easy way is to get a fluid pump, stick a hose into that filler hole, pump out the fluid, and then pump the new fluid back in. However, doing a full diff cover removal isn't that hard, and that's coming from someone who doesn't do a lot of wrench turning.
1. Put a drain pan underneath diff.
2. Slowly loosen all the bolts, then pry off from the bottom, letting all the fluid drain into pan.
3. Clean off any old gasket material being careful not to gouge the housing around diff and diff cover.
4. Take this opportunity to clean the diff housing and cover inside and out, and inspect for obvious damage-- chipped teeth or large amount of metal filings at bottom of pumpkin.
5. Put on new gasket (highly recommended, although you can just use a bead of RTV if you can't find or buy a gasket), and cover gasket with thin bead of RTV.
6. Place diff cover back on, torque bolts down to 30ft lbs (check service manual for tightening patterns and verify torque specs)
7. Fill with fluid through drain plug.
8. Clean everything up so the diff looks like new, watch closely for leaks over the next week or so.
Note plug 1/2 way up toward right side:
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