4WD MODIFICATIONS - TRACTION AIDS
LOKKA is an automatic differential locker that can be fitted to front, rear or both differentials. This auto-locking diff centre has been manufactured in Australia since the 1990s.
Many newcomers to serious 4WDing make the mistake of assuming that traction control does away with the need for differential locks. However, an examination of traction control (TC) operation shows that a relatively small accumulator applies and re-applies the brakes to reduce wheelspin and when that energy reservoir runs out of ‘puff’ there’s no more TC action until it builds up pressure once more. Also, the brakes can become so hot from prolonged TC operation that they become ineffective.
LOKKA is a fully automatic differential lock that doesn’t require manual operation. There are no switches, external lines, electric or pneumatic controls. It relies on a simple mechanical design which makes use of two distinct sets of forces: the ‘ground driven’ forces acting on a wheel when cornering that force an outside wheel to turn faster and the driveline forces turning the differential and axles.
The combination of these two sets of opposing forces and the LOKKA design allow the automatic engagement and disengagement of the driving gears when a vehicle turns or otherwise requires differential action.
Wheel slippage or a loss of traction can occur for many reasons off-road and include excess throttle, fast approach speeds, limitations in wheel travel (especially in the case of independent front suspension vehicles), weight transfer off drive wheels and slippery surfaces such as mud, sand, snow, shale and even just wet grass.
In many of these circumstances both the normal standard differential and LSD centre will allow the wheels with the least resistance to spin. Thus the wheels with traction do not obtain any real drive and the vehicle will lose speed or stop.
LSD centres assist under these circumstances only if they are in good condition and if there is enough resistance on the spinning wheels to activate the clutch pack or gears to force drive to the wheels with traction. It’s important to note that even a new LSD will allow a lifted wheel to spin freely with no drive to the wheel with traction.
Toyota LSDs are notoriously poor performers that lose capability very quickly and Nissan’s LSDs are the best in the market.
LOKKA overcomes the traction deficiency of the standard differential and LSD centre to ensure that a 50:50 power split is achieved when driving, irrespective of ground conditions, while still allowing differential action when cornering on hard ground.
Whether fitted to front or rear or both differentials, traction performance is significantly improved in all situations.
LOKKA enjoys an excellent reputation for reliability throughout the world and is sold on every continent.