When a technician can hold one wheel stationary while rotating the other wheel, what does it indicate about the differential?

Holding one wheel stationary while the other wheel rotates is indicative of a specific function of certain types of differentials. When this occurs, it suggests that the differential is capable of locking, which is a characteristic feature of certain locking differentials.

In a traditional open differential, if one wheel is held still, the other wheel will not rotate due to the way torque is distributed; the rotating wheel will simply lose traction and remain stationary. However, if a technician can hold one wheel in place while the other turns, it demonstrates that the differential has the ability to engage mechanisms that allow for synchronized movement, typically seen in locking differentials.

This ability can enhance traction, particularly in off-road or slippery conditions, by preventing the free-spinning of one wheel while the other effectively drives the vehicle forward. Such mechanisms may include a mechanical or an electronic locking feature designed to improve the vehicle’s handling and grip under varying driving conditions. Therefore, choosing the indication that the differential is capable of locking accurately reflects this capability.