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im assuming its a 10 bolt..... there should be a plug on the pass side of the differential, remove that to ut the gear oil in,
if its a 9 bolt the fill is on the cover.

to make it stop leaking remove the cover bolts and cover, clean both mating surfaces (cover and diff) than eather use strait RTV or a dff cover gasket. than re-assemble wait a little while for rtv to set than fill with 80W-90..... 3.5 pts......
Luke

 

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The gear lube bottle should have a nipple thingy on the end. If you can't fit it in the fill hole, slide a piece of 3/8" hose over it and run it into the fill hole to the rear.

 

There's also a bottle pump (sold at most auto supply stores) which is cheap and works pretty well.

JamesC

 

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80W-90 or 85W-90 gear oil, regular not synthetic.

Edit:

If you jack up the rear of the car, put jack stands under the rear frame rails in front of the lower control arms, and then let the rear axle hang down (remove jack), it is really close to being level. You should be able to pour the fluid in with just the nipple on the end of the bottle. Should take 2-3 quart bottles. Stop filling when it starts to run out of the hole.

 

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Many members on the board, to include me, use Mobil 1 75-90 synthetic (with a bottle of GM additive if you're running a limited slip).

JamesC

 

would 85w-140 gear oil work? I think that is the only gear oil that autozone carries.

 

No, it should be either 80 or 85 W90. They have it, ask someone that works there.

 

will do thank you guys. I can always count on the integrity of this forum.

 

I run 80-90W Lucas Synthetic oil and Posi additive, however my way of adding the fluid is a little diffrent.. I take a bottle of motor oil, cut it in half, clean it out then screw on the nipple from a gear oil bottle and attach a 3/8 clear hose then raise the bottle above the diff and pour in from the top ( usually only takes about 5 minutes to add the 3.5 pints )