2005 Dodge Durango Owner's Manual - Page 230

230 STARTING AND OPERATING vehicle in the 4LOCK position on dry hard surfaced roads. This feature provides the safety, security, and convenience of operating in all-wheel drive at all times regardless of road conditions. When additional traction is required, the 4LOCK and 4LO positions can be used to lock the front and rear driveshafts together through the transfer case inter-axle differential and force the front and rear wheels to rotate at the same speed. This is accomplished by rotating the 4WD Control Switch to these positions. The 4LOCK and 4LO positions are intended for loose, slippery road surfaces only. Driving in the 4LOCK and 4LO positions on dry hard surfaced roads may cause increased tire wear and damage to the driveline components. The transfer case Neutral (N) position is selected by depressing the recessed button located on the lower left hand corner of the 4WD Control Switch. NOTE: The transfer case Neutral (N) position is to be used for recreational towing only. See Recreational Towing section for specific procedures on shifting into and out of Neutral (N). Transfer Case Position Indicator Lights Transfer case position indicator lights are located on the instrument cluster. If there are no indicator lights on or flashing the transfer case position is All-Wheel Drive (AWD) and indicate the current and desired transfer case selection (4HI ⇔ 4LOCK). The "SVC 4WD" warning light monitors the electric shift 4WD system. If this light remains on after engine start up or illuminates during driving, it means that the 4WD system is not functioning properly and that service is required.