What type of rear differential fluid does the 2004 chevy silverado use?

The 2004Chevrolet Silverado uses SAE 80W or SAE 80W-90 GL-5 gear lube for the rear differential. This can be found at most retail locations, and at any automotive parts and accessories store. You can expect to pay between $12 and $43 per quart of this lubricant. You don't need to worry about what happens if You run out, however. You would have to skip all routine maintenance services with Your dealer for years before it would run out or become dry. You can expect to pay between $43 and $120 for labor to have it changed by an automotive service professional.