What's the 2000 Chevy silverado rear differential fluid type?

The recommended differential fluid for the rear axle is listed aS75w-90 by the manufacturer of the 2000 Chevy Silverado. The recommended service interval for replacing the diff fluid is every 30,000 to 60,000 miles depending on how much You are using the truck to tow or carry heavy loads. It is important to replace the fluid because it allows Your car to drive smoother and keeps the gears lubricated to prevent any damage. Some of the signs of needing a fluid change is gear noise at an idle, rattling or clanking noise, heavy vibrations and gear grinding sound when the truck accelerates. The cost for the fluid will range from $5 - $20 depending on the brand and quality You choose.