QUICK!!! What Weight Gear Oil?

[jes72mustang]

Ok I need a quick reply, I have the axles at the shop getting the old bears pressed off and new ones pressed, and I am swapping the diff today as well. I need to know what weight gear oil to buy and how much? 9 inch 28 spline axles, going to 3:50 open gears.

First reply gets my gratitude.....

 

[1966conv]

Since you're going with an open you don't need friction modifier.
You'll need about 3 qts of 90 weight gear lube.