Neptune, whenever I think of differentials, i think of the movie "My Cousin Vinny"

BTW, some cars do not use wheel braking for electronic traction control. My Taurus retards engine timing instead of braking the slipping wheel. When I had my car on the lift and the technicians were troubleshooting a vibration, they thought the trans had died because no matter how much gas they gave it, the wheels didn't spin and the engine sounded labored. Turns out no one turned off traction control because the system detected the rear wheels not spinning and/or the front wheels were spinning at drastically different speeds.