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There are two methods available. You can purchase a fluid pump that will do the job without removing the cover. Run the vehicle for a few miles to warm the fluid. Remove the fill plug....it'll take a 3/8" drive ratchet. Insert the correct tube from the pump into the hole enough to reach the bottom of the diff. Pump out all fluid. You can refill with the pump. It's full when you can insert a finger into the fill hole and touch fluid.

The other method is to remove the rear cover from the diff. I prefer this anyway as I am able to get a look at the rear and see if there is any odd wear or a lot of metal shavings in it. Make sure to install a new gasket. RTV black also works well and is used by many manufacturers instead of an actual gasket. Just make sure both surfaces are completely clean and dry. Refill as above. If it's a posi diff don't forget to use the special additive available at any parts store.

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Q: How do you change the differential fluid ON a 1980 Pontiac firebird?
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