2007 Dodge Nitro Owner's Manual - Page 260

260 STARTING AND OPERATING This electronically shifted transfer case provides 2 mode positions: 2 (rear) wheel drive high range (2WD) and 4 wheel drive high range (4WD LOCK). The electronically shifted transfer case is designed to be driven in the 2 wheel drive position (2WD) for normal street and highway conditions (dry hard surfaced roads). When additional traction is required, the transfer case 4WD LOCK position can be used to lock the front and rear driveshafts together and force the front and rear wheels to rotate at the same speed. This is accomplished by rotating the 4WD Control Switch to the desired position - refer to "Shifting Procedure" for specific shifting instructions. The 4WD LOCK position is designed for loose, slippery road surfaces only. Driving in the 4WD LOCK position on dry hard surfaced roads may cause increased tire wear and damage to the driveline components. Transfer Case Switch NOTE: Do not attempt to make a shift while only the front or rear wheels are spinning. Shifting while only the front or rear wheels are spinning can cause damage to the transfer case.