When do I use the 4x4 Low-Range mode?

Low-Range is for extreme off-road situations needing more torque with low speed, such as getting out of a tough driving spot or steep climbs. More torque does not mean more traction though, so it can be unsafe on slippery surfaces like snow, ice or mud.

How fast can I drive in 4x4 Low-Range?

Do not exceed 25 mph (40 km/h). When engaging or disengaging low-range mode, do it only when the vehicle is moving at 2 to 3 mph (3 to 5 km/h) or slower. Avoid using this mode for normal driving.