Knowing what type of lube to run in your gears is half the problem. The other we half we tackle by showing you how to change differential fluid. This task remains about the same, regardless of what type of differential you're dealing with. What does change is which type of lube that you use. We're changing the lube in a 2003 Silverado 1500HD, so it's running a G80 limited-slip differential. In this rearend, if you're running synthetic oil, then you really don't need to add friction modifiers like an LS additive. Furthermore, these truck G80 diffs only require GL-5 lubricant without additive, since the locking mechanism works different than the typical posi-traction rearends in Muscle Cars.

GM 14-bolt Diff Cover Gasket: https://amzn.to/3ly0o8V
Milwaukee M12 FUEL Ratchet: https://homedepot.sjv.io/1577ma
Lucas 75-90 Synthetic Gear Oil: https://amzn.to/3tJCESM
Permatex Gasket High-Tack Spray Gasket: https://amzn.to/3nQU5A7
Roloc Bristle Discs: https://amzn.to/3AgLxFW
MechanixWear Nitrile Gloves: https://amzn.to/3kbqjnk
Gearwrench 90T Ratchets: https://amzn.to/3EmjHKY

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