2006 Dodge Durango Owner's Manual - Page 256

256 STARTING AND OPERATING 4LOCK Four-Wheel-Drive LOCK - Locks the transfer case interaxle differential. Forces front and rear wheels to rotate at the same speed. Additional traction for loose, slippery road surfaces only. 4LO Four-Wheel-Drive Low Range - Low speed 4 wheel drive. Locks the transfer case inter-axle differential. Forces the front and rear wheels to rotate at the same speed. Additional traction and maximum pulling power for loose, slippery road surfaces only. Do not exceed 25 mph (40 km/h). N Neutral - Disengages both the front and rear driveshafts from the powertrain. To be used for flat towing behind another vehicle. See Recreational Towing for more information. Shifting Procedure - NV 244 Generation II Transfer Case NOTE: The 4x4 system will not allow shifts between AWD/ 4LOCK if the rear wheels are spinning (no traction). In this situation a position indicator light will flash and the original position indicator light will remain ON. At this time, reduce speed and stop spinning the