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remove the diff cover and let the fluid drain out into a pan. clean the mating surfaces on the both the diff and the cover. use gasket sealer (or proper gasket) on the cover and replace the cover, torque to spec. unbolt the filler cover located on the either the diff or the cover itself. stick the gear oil nozzle in the hole and fill until fluid starts to overflow from the filler hole. replace the filler bolt. you need to know if the rear end has a posi in it. GM posi units require a special additive.

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16y ago
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Q: How do you change rearend gear fluid on 91 silverado?
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