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How do you change the differential fluid on a 2001 GMC Sierra 1500?
Nickmendezinak
You have to pull the diff. cover and let it drain. Then replace the gasket. Put the diff cover back on then fill with gear oil. 75w-90 is recommended but 75w-140 could be used if you are towing a lot. Fill to about 5/8" below the fill plug on the top front of the diff.
No you don't have to unbolt the cover. First check to see if you have a drain plug. It will be on the bottom of the differential housing. If you do it will save you money on a gasket.
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∙ 12y ago
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