What is the difference between permanent and engageable 4WD drive systems?

Permanent 4WD drive systems use a center differential that allows the front and rear driveshafts to turn at different speeds, allowing drive on dry surfaces under normal driving conditions. The switchable systems have no center differential and simultaneously lock the front and rear driveshafts. With an engageable drive system , 2WD mode is only suitable for off-road driving or on wet or slippery surfaces.

Why can’t the switchable 4WD system be used on dry surfaces?
The 4WD switchable systems effectively lock the front and rear driveshafts forming a single drive unit that does not allow the two front and rear driveshafts to act differently from each other. If used too much on dry surfaces or when cornering, noises and blockage of the transmission (“jolts” or crow hop ) can occur . Blockage can cause heat build-up and premature part breakage.

Why Do Crow Hopes Occur?
When a vehicle takes a bend, the wheels turn with a different turning radius, thus covering different distances at different speeds. when cornering on dry surfaces sometimes the difference in wheel speed causes the transmission to lock, which is then released with a “bang” or a “vibration” of the vehicle when one of the wheels loses. traction.

Can I operate the 4WD High mode at any speed?
4WD High mode can be operated with the vehicle stationary or moving. In the latter case, the mode must be operated at a speed not exceeding 88 km / h.