Electric differential lock is very versatile

. The Kam Diff-lock has been developed and patented by Godalming-based Kam Differentials. To activate it, the driver presses a switch in the cab, which sends 45A to a solenoid – pre-loading a spring that presses a sliding dog into position to lock the differential. The solenoid is dual coil, and only 1A is required to hold the lock in position and ensure that both half shafts have to rotate together. Switching off causes the lock to disengage. There are many differential locks on the market, but this one is unique in the way that it can be retrofitted. Technical director Richard Tracy explained: “It’s a very versatile system. The patent is about cutting off the back of the differential pan and the mounting of the solenoid.” The system uses a special diff pan, which encloses all the key components inside the axle casing. It was originally developed for the military, to produce a more cost effective axle locker that would be easy to install on a factory production line or to retrofit. The system includes a 4-pinion differential carrier, which has been tested to be 40% stronger than a standard component. A standard 110 Series Land Rover can be upgraded with the system for under £1000, excluding fitting. Recently, the company has signed a contract to supply the system as a standard production fit for the PS10 4x4 made by Santana in Spain. Kits are available for most Land Rovers, Range Rovers, the Suzuki range and Toyota Land Cruisers.