(4H) Operation

(4H) provides electronically locked four-wheel drive power to both the front and rear wheels for use in off-road or winter conditions such as deep snow, sand or mud. This mode is not for use on dry pavement. Shifts from (2H) to (4H) can be made at any speed. In (4H):

• The ATCM sends a (4H) mode status to the AWD module via the GWM.
• The shift motor positions the ball ramp device to completely apply the clutch.
• The reduction sleeve connects the input shaft and output shaft
• (4H) is displayed in the message center.