How would I flush rear gear oil?.Is there a pump to avoid dissasembly?

 

there are pumps,but you are going to want to take the cover of to inspect the gears for wear and chips,and u will want to wipe out the case clean before instaling the new oil.

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Corvette King is right, be sure to inspect the inside. Depending on what year you have you may have alot of wear inside. In the late 70's GM didn't heat treat the half shafts. When I rebuilt my 79's differential the half shafts had mushroomed inside the differetial and damaged alot of the gears, and the clutchs were in pretty bad shape.