I just recently ordered some new diff covers for my truck and plan on changing the gear oil in the diffs as I have no idea when the gear oil was last changed since I bought the truck not running.
So that leads to me to my questions. I am a big proponent of using Amsoil in just about everything. However upon looking into what is recommended for the trucks, I am coming up with 80W-90 for the front diff (Dana 60) and 75W-140 for the rear diff (10.25LS). I plan on running Amsoil, and even though their gear oil has friction modifiers in it, I plan on running 4oz of their friction modifier just to be on the safe side.
Amsoil recommends:
80W-90 in both diffs, but also suggests 75W-90 and 75W-110
What weight gear oil are you running in your diffs?
What brands are you using?
So that leads to me to my questions. I am a big proponent of using Amsoil in just about everything. However upon looking into what is recommended for the trucks, I am coming up with 80W-90 for the front diff (Dana 60) and 75W-140 for the rear diff (10.25LS). I plan on running Amsoil, and even though their gear oil has friction modifiers in it, I plan on running 4oz of their friction modifier just to be on the safe side.
Amsoil recommends:
80W-90 in both diffs, but also suggests 75W-90 and 75W-110
What weight gear oil are you running in your diffs?
What brands are you using?