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At what mileage should the Differential be serviced? 1998 4.3 2wd. Auto. What is best Gear oil to use? No issues , just want to keep up with maintenance. TIA
 

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1994 GMC Jimmy SLE 4.3 CPI 4x4
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That’s should be in your owners manual, if you don’t have yours you can find pdf versions online.
 

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Rear end oil should be replaced 30,000-60,000 miles
 
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