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STARTING AND OPERATING 317 shift completion to occur. The preferred method is with the vehicle rolling 2 to 3 mph (3 to 5 km/h). Avoid attempting to engage or disengage 4L with the vehicle moving faster than 2 to 3 mph (3 to 5 km/h). • Do not attempt to shift into or out of 4L while the transmis- sion is in gear. Transfer Case Position Indicator Light The “Transfer Case Position Indicator Light” in the instru- ment cluster is used to alert the driver that the front axle is fully engaged and all four wheels are driving. AIR SUSPENSION SYSTEM (2500/3500 MODELS) — IF Description This air suspension system is a rear leveling ride height system. The main purpose of this system is to maintain the truck’s rear ride height level. There are two selectable heights that can be chosen based on your operating conditions. tion or the engine running with zero vehicle speed for all user requested changes and load leveling. Rear Leveling Ride Height Switch Normal Ride Height (NRH) – This is the standard position of the suspension and is meant for normal driving. It will automatically adjust to maintain the rear ride height as conditions change. approximately 1 in (25 mm) for a level truck, to be used as required while trailer towing. It will automatically adjust to maintain the rear ride height as conditions change. 5 |