Grand Cherokee 2WD L6-4.0L VIN S (1997)
Drive/Propeller Shaft: Description and Operation
The function of a propeller shaft is to transmit power from one point to another in a smooth action. The shaft is designed to send torque through an angle
from the transmission to the axle.
The propeller shaft must operate through constantly changing relative angles between the transmission and axle. It must also be capable of changing
length while transmitting torque. The axle rides suspended by springs in a floating motion. This means the propeller shaft must be able to change angles
when going over various roads. This is accomplished through universal joints, which permit the propeller shaft to operate at different angles. The slip
joints (or yokes) permit contraction or expansion.
Tubular propeller shafts are balanced by the manufacturer with weights spot welded to the tube.
The propeller shaft is designed and built with the yoke lugs in line with each other which is called phasing. This design produces the smoothest running
condition. An out of phase shaft can cause a vibration.
Before undercoating a vehicle, the propeller shaft and the U-joints should be covered. This will prevent the undercoating from causing an out of balance
condition and vibration.
CAUTION: Use exact replacement parts for attaching the propeller shafts. This will ensure safe operation. The specified torque must always be applied
when tightening the fasteners.
