2004 Jeep Wrangler Owner's Manual - Page 168

168 STARTING AND OPERATING WARNING! Do not coast in N (Neutral) and never turn off the ignition to coast down a hill. These are unsafe practices that limit your response to changing traffic or road conditions. You might lose control of the vehicle. Overdrive (O/D) For most city and highway driving. The transmission contains an electronically controlled Overdrive, and will automatically shift from D (Drive) to O/D (Overdrive) if the following conditions are present: • The transmission selector is in D (Drive). • The O/D OFF switch has not been activated. • Vehicle speed is above approximately 30 mph (48 km/h). When frequent transmission shifting occurs while using Overdrive, such as when operating the vehicle under heavy load conditions (for example, in hilly terrain, strong head winds, or trailer towing), turning off overdrive will improve performance and extend transmission life by reducing excessive shifting and heat buildup. Overdrive can be locked out by pressing the O/D OFF switch located on the instrument panel. The O/D OFF indicator light (on the switch) will illuminate to show that the switch has been activated. When the indicator light is on, Overdrive is locked out. Pressing the switch a second time restores the Overdrive function. The lockout feature is useful when towing a trailer or carrying a heavy load.