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Gear oil, 85/140
I buy Coastal gear oil in a 25 pound bucket - it's the cheapest way. I'm on my second bucket /forums/images/graemlins/smile.gif
I use it all the time - both axles in my Chevy, the 465, the 205, and the rear axle in my Dodge DD.
85\140 /forums/images/graemlins/blush.gif, in a 465 i run 80\90 in my trucks 465, front 10 bolt and rear 12 bolt, why the heavy lube, does it work that much better?
85/140 is thicker, lubes better but has more drag.
If you want more protection quieter operation and don't mind the 1% loss in fuel economy go with the thicker oil.
If you are looking for the last HP you can squeeze out of you engine go with the thinner, even 75/90 synthetic.