The Rear-Axle Lock.
Serial vehicles 4x2 and 4x4.
Differential Lock for Serial Vehicle at the Rear Axle
The lock is purely mechanical with a 100% locking effect for Mercedes-Benz Sprinter, Mercedes-Benz Vito / Viano and Volkswagen Crafter.
There are situations in which a locking differential is of benefit. This includes start-up under difficult conditions off-road. The locking differential diverts the drive torque from a slipping wheel to the wheel with the better ground adhesion and thus improves traction. Watering of boats in slip systems isn't entirely without problems either.
Mostly 100 % locks are used as traction differentials (i.e. differential locks).
A locking differential is a special differential gear in a multi-track vehicle with the purpose of preventing one wheel from spinning at bad ground adhesion and the other – and thus the vehicle as a whole – no longer receiving any drive torque.