NV244 GENII

DESCRIPTION

The NV244 GENII is an electronically controlled full and part-time transfer case with no two wheel drive operation.

A differential 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.

The geartrain is mounted in two aluminium case halves attached with bolts. The mainshaft front and rear bearings are mounted in aluminum retainer housings bolted to the case halves.

OPERATING RANGES

NV244 GENII operating ranges are:

- AWD(All-Wheel Drive)
- 4LOCK (Part-time)
- 4LO
- NEUTRAL

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

The 4LOCK (Part-time) and 4LO ranges are for off road use only. The only time these ranges can be used is when the road surface is covered with snow, ice, or other loose slippery material.

SHIFT MECHANISM

Operating ranges are selected with a dash mounted shift selector switch. The shift selector switch provides a input to the Transfer Case Control Module (TCCM) to indicate the driver's desire to change operating ranges. The TCCM 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 TCCM decides the shift is permitted, the TCCM controls the shift motor, mounted to the exterior of the transfer case, to perform the shift.

IDENTIFICATION






A circular ID tag is attached to the rear case of each transfer case (Fig 1). 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 splined to a differential assembly. Depending on the position of the mode fork and sleeve, the front output shaft is driven directly by the mainshaft or through the differential. The mode fork operates the mode sleeve and hub. The sleeve and hub are riot equipped with a synchronizer mechanism for shifting.