abstract:A locking differential, differential lock, diff lock or locker is a variation on the standard automotive differential. A locking differential may provide increased traction compared to a standard, or "open" differential by restricting each of the two wheels on an axle to the same rotational speed without regard to available traction or differences in resistance seen at each wheel.
Both cars can be equipped with optional torque vectoring, a brake-based system built to augment the mechanically locking rear differential and help put power to the ground.
The M5's reinforced active locking and torque-vectoring rear differential (the Active M-Differential) brilliantly adjudicates traction between the rear wheels.