Choice of Gear Oil

[Jmac130]

still waiting for a link to this non synthetic valvoline 75/90 gear oil...

& any shred of proof that synthetic oil or gear lube is "10%"....

I just replaced my diffs and transfer case oil. This article was my go to:

Trail Maintenance: Driveline fluids, how and when to change them - Trail4R.com - 5th Gen 4Runner Mods

I decided to go with amsoil SEVERE GEAR 75W-90 for the front and rear diffs due to the bag design that you can just pour in. I went with the OEM Transfer Gear Oil And used one can.