6.7L Cummins Forum

The NV246 is an electronically controlled active full-time transfer case.
A wet clutch in the transfer case is used to control torque transfer to the front and rear axles. A low range gear reduction system provides increased low speed torque capability for off road operation. The low range provides a 2.72:1 reduction ratio.
OPERATING RANGES

NV246 operating ranges are:

• AWD (All-Wheel Drive).
• 4LO.
• NEUTRAL.
• 2HI
• 4HI Lock

The AWD mode can be used at any time and on any road surface.
SHIFT MECHANISM

Operating ranges are selected with a dash mounted shift selector switch. The shift selector switch provides a input to the Front Control Module (FCM) to indicate the driver's desire to change operating ranges. The FCM uses this input, along with the input from the transfer case mounted mode sensor and information from the vehicle's bus, to determine if a shift is permitted. If the FCM decides the shift is permitted, the FCM controls the shift motor, mounted to the exterior of the transfer case, to perform the shift.
IDENTIFICATION



A circular ID tag (3) is attached to the rear case of each transfer case. The ID tag provides the transfer case model number, assembly number, serial number, and low range ratio.
The transfer case serial number also represents the date of build.

OPERATION

The input gear is splined to the transmission output shaft. The input gear drives the mainshaft through the planetary assembly and range sleeve. The front output shaft is operated by a drive chain that connects the shaft to a drive sprocket on the mainshaft. The drive sprocket is engaged/disengaged by moving the clutch lever, which compresses the clutch pack

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
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