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The 2006 Chevy Silverado has a different oil capacity for its rear differential depending on the size, ranging from 2.2 quarts to 3.2 quarts. Make sure to check which one you have for an accurate refill. Use 75W-90 synthetic gear oil as the oil type, and any brand will work fine. Consider adding an additive, like the K&W TransX Posi-Trax limited Slip Gear Oil Additive, to reduce chattering, jerking, and slipping in the differentials. Even if the gear oil already contains additives, it's a good idea to include this additive for optimal performance.
In a 2006 Chevy Silverado, the amount of fluid needed for the rear differential is 5.4 quarts.
Holds around 2.5 quarts.