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You want a GL-4 in the tranny (I use a 75-90) and a GL-5 (extreme pressure) in the rear. Redline makes some great products for both.



How about Valvolines race 80/90 I can find that on
the shelf here.

Live in Ford nightmare hell land.......



I'd be willing to bet the Valvoline 80/90 is a GL-5 Hypoid gear lube. Designed for rear-end (ring and pinion) use. Fine for the rear, not so fine for the 833. Find a GL-4 for that.