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The 2004 Chevrolet Silverado requires SAE 80W or SAE 80W-90 GL-5 gear lube for its rear differential. This gear lubricant is readily available at most retail locations and automotive parts stores, typically costing between $12 and $43 per quart. If you ever run low on this lubricant, there is no need to worry, as it would take years of neglecting routine maintenance services before it would run out or cause any issues. When getting the lubricant changed by a professional automotive service, you can expect to pay between $43 and $120 for labor.
For a 2004 Chevy Silverado, make sure to use Super Tech's full synthetic gear lubricant 75w-90.
In the 2004 Chevy Silverado, they use a heavy and dark rear axle fluid as the type of differential fluid.
Is it okay to use 80W-90 GL5 gear oil in the rear differential?
Synthetic motor oil with a viscosity grade of 75-90 weight.