The differential lock (difflock) is a mechanism that locks the rear or front differential in place, forcing both wheels on the same axle to rotate at the same speed. This can increase traction and improve off-road or low-traction conditions like snow, mud, or loose gravel. Meanwhile, the propshaft (also known as the driveshaft) is a component that transmits power from the transmission to the differential, which powers the wheels. Without a functioning propshaft, the car would not be able to move. Together, the difflock and the propshaft help ensure power is delivered effectively to the wheels, allowing the car to move in various conditions.