Lucas SAE 75W-90 Synthetic Gear Oil is a non-foaming, super slick, long lasting lubricant designed especially for heavy duty or high performance applications where other gear lubricants just aren't good enough.
Working great in my GM differential with G80 LS/LOCKER
I've used many lucas products before and they've always worked great for me, especially the upper cylinder lubricant. They say this 75w90 is good for limited slip and hypoid gears which perfect for my 2004 silverado which is a hybrid of both locked and limited slip. No additives needed.