Rear differential/rear end oil
You can use any SAE 75W-90 Synthetic Axle Lubricant that meets GM Specification 9986115 which is basically API GL-5, Mobil-1 75W-90 is fine. No additives
just about any gear oil will work good 75w-90 it doesnt have to be synthetic.
My front diff didn't like regular gear oil (chatter when backing up). I switched to Lucas 75W-90 synthetic and it was nice and smooth.
i use lucas or at truck stops they have oil call power punch that has always worked good for me
Just talked with the dealer about my Silverado 2500 2014 LT. Front and Rear Differential receives 75-90 Synthetic The Transfer Case gets Dex VI.
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