The component that connects and distributes the power from the transmission to the rear wheels as well as what allows us to take turns without the wheels’ scrubbing the pavement is called a rear differential. Most people don’t give it a thought but if you have a rear wheel drive or 4 wheel drive vehicle the fluid in the rear differential is what lubricates and cools all of the critical parts. A lot of today’s rear differentials have specific fluids because of different unique designs and must be inspected and replaced periodically to ensure trouble free operation. There are many designs that require a competent experienced professional attention to detail when it comes to servicing or repairing today’s rear differential designs.