I run full synthetic Valvoline 75w90 gear oil. It is rated GL-4 and has friction modifier in it.
But after saying that it has the friction modifier in it you need to pay attention to what the rear does to see if you might need to add more modifier. I have heard that this is needed with any...
Don't forget that the selector valve also has the tank level wiring in it.
Plus to keep fuel returning to the correct tank will take a 6 way valve. A feed and return from each tank and the feed and return from the fuel pump and heads
Adding extra valves may confuse you at the wrong moment...
As with any forum it takes a while to get used to.
On the other forums that I am on the New Post box is a little bit more prevalent along with the Mark Forums Read box.
But I come here for information or to provide information and have gotten used to the new layout.
Your original owners manual stated Mercron for the manual transmission and transfer case.
Over the years they discontinued Mercron and upgraded it all the way to Mercron V.
I have use Walmart SuperTech version of Mercron for every transmission and transfer case fluid change.
They won't because the general public that are buying these trucks want every bell and whistle that they can put on them.
When was the last time you saw just a basic truck out on the lot?
I don't even know if you can purchase a XL truck anymore with having to special ordering it.
Sent from my...