How to Change Differential Fluid

Here's how to change the rear differential fluid on a RWD or AWD vehicle.

The rear differential is responsible for transferring rotational motion from the longitudinal driveshaft to the two half shafts (or CV shafts) situated laterally out to the rear wheels.

Situated in the center of the vehicle between the rear wheels, the rear differential is self lubricated, encased in gear oil, to keep it cool, preventing rust and seizure.

The fluid exchange procedure involves draining the fluid out the drain plug, and pumping in fresh fluid into the fill plug above. make sure the fill plug is loosened first, otherwise you won't be able to get new fluid in if you drained it all and can't open it.

Both the drain and fill plugs take a 10mm hex socket. In this case, the hex stripped out on the drain bolt, and a fluid transfer pump was used to suck out all the old fluid through the fill plug as a work-around.

The vehicle in this video is a 2007 Toyota RAV4 with AWD. 80W90 viscosity gear oil was used to replenish the fluid.

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