angrymuffin
New member
Currently I'm using 32" tires and have 3.21 gears. I'm trying to figure out the correct gear oil weight to use in my rear differential. When I bought the jeep it came with 29" tires and noticed a considerable drop in power when I switched to 32" tires but definitely still drivable. It almost feels as if I'm towing something all the time. Does this mean that I should use 75w140 in the rear differential or would using 80w90 still be ok?