What's the 2006 Chevy silverado rear differential fluid capacity?

The 2006 Chevrolet Silverado has a rear differential oil capacity of between 2.2 quarts (with 8.6" differentials) to 3.2 quarts (witH11.5" differentials), so You'll need to see which You have to know precisely. For the oil type itself, You'll want to use 75W-90 synthetic gear oil; any brand is going to be fine. You'll additionally want to use an additive, such as the K&W TransX Posi-Trax limited Slip Gear Oil Additive. I swear by this stuff, personally, because it's absolutely the essential way to limit chattering by the differentials, as well as avoid jerking and slipping. Even when the gear oil mentions having additives, it's safe and recommended to add this as well.