Doing front and rear diff fluid change soon. Any recomendations for front and rear? Its a g80 rear, 2008 1500. Thanks!

 

I use regular old valvoline diff fluid.

80W90, you can pick a synthetic if you wish or look in your owners manual as it could say otherwise.

I know alot of people do not do this but I do just because I can and the bottle is really cheap, but I always add a small bottle of friction modifier additive to the rear diff.

 

Appropriate interval fluid change is more important than brand of fluid imo. I use walmart supertech fluids when possible.