lastgreatroadtrip.com/4x4-adventure-how-to/changing-rear-differential-oil-fj-cruiser/
The gear oil in your rig keeps friction to a minimum and ensures the long life of your differential gears. Changing the oil in the rear differential is an easy maintenance activity that keeps your off road rig motoring forward, saves money and allows you to learn a little more about your 4×4 adventure vehicle.
You will find more information about changing your rear differential oil at - lastgreatroadtrip.com/4x4-adventure-how-to/changing-rear-differential-oil-fj-cruiser/