Jeep 2004 Grand Cherokee User Manual download pdf (Page 187)

mode allows the front and rear wheels to rotate at

different speeds which eliminates driveline binding and

component wear that is normally associated with driving

the vehicle in the 4 PART TIME position on dry hard

surfaced roads. This feature provides the safety, security,

and convenienceof operating in 4 wheeldrive atall times

regardless of road conditions.

When additional traction is required, the 4 PART TIME

and 4LO positions can be used to lock the front and rear

driveshafts together through the transfer case inter-axle

differential and force the front and rear driveshafts to

rotate at the same speed. This is accomplished by simply

moving the shift lever to these positions. The 4 PART

TIME and 4LO positions are intended for loose, slippery

road surfaces only. Driving in the 4 PART TIME and 4LO

positions on dry hard surfaced roads may cause in-

creased tire wear and damage to driveline components.

The PART TIME indicator light, located in the instrument

panel, alerts the driver that a four wheel drive mode

which locks the front and rear driveshafts together has

been selected. This light illuminates when the transfer

case is shifted to either the 4 PART TIME or 4LO

positions. There is no light for the 2WD, 4 FULLTIME, or

N (Neutral) positions.

NOTE: Do not attempt to make a shift while only the

front or rear wheels are spinning. The Selec-Tract trans-

fer case is not equipped with a synchronizer and there-

fore the front and rear driveshaft speeds must be equal

for the shift to take place. Shifting while only the front or

rear wheels are spinning can cause damage to the trans-

fer case.

When operating your vehicle in 4LO, the engine speed is

approximately three times that of the 4 ALL TIME

position at agiven road speed.Take care notto overspeed

the engine and do not exceed 25 mph (40 km/h).

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Jeep 2004 Grand Cherokee User Manual Page 187