2010 Jeep Wrangler Owner's Manual - Page 348

STARTING AND OPERATING 347 NOTE: Do not attempt to shift when only the front or rear wheels are spinning. The transfer case is not equipped with a synchronizer, and the front and rear driveshaft speeds must be equal for a shift to take place. Shifting while only the front or rear wheels are spinning can cause damage to the transfer case. When operating your vehicle in 4L, the engine speed will be approximately three times (four times for Rubicon models) that of the 2H or 4H positions at a given road speed. Take care not to overspeed the engine. WARNING! You or others could be injured if you leave the vehicle unattended with the transfer case in the N (Neutral) position without first fully engaging the parking brake. The transfer case N (Neutral) position disengages both the front and rear driveshaft from the powertrain, and will allow the vehicle to move regardless of the transmission position. The parking brake should always be applied when the driver is not in the vehicle. 5 Proper operation of four-wheel drive vehicles depends on tires of equal size, type, and circumference on each Shift Positions wheel. Any difference will adversely affect shifting and For additional information on the appropriate use of each cause damage to the transfer case. transfer case mode position, see the information below: Because four-wheel drive provides improved traction, 2H Position there is a tendency to exceed safe turning and stopping This range is used for normal street and highway driving speeds. Do not go faster than road conditions permit. on hard-surfaced roads.