Propeller Shaft; Description; Propeller Shaft Runout; Driveline Vibration - Jeep 1987 Wrangler Workshop Manual

STEERING AND FRONT AXLE
PROPELLER SHAFT
DESCRIPTION
The front propeller shaft has single cardan
universal joints (A-B) at each end. A slip yoke
(C) connects the shaft to the front axle yoke.
101515
Propeller Shaft Lubrication
The shaft universal joints and the slip yoke are
equipped with zerk-type lubrication fittings. The
slip yoke and joints should be lubricated at
periodic intervals with chassis grease.
Driveline Vibration
Driveline vibration may be caused by a loose,
worn, or damaged propeller shaft, axle yoke, or
universal joint. Driveline vibration may also be
the result of a loose or damaged engine/
transmission mount, engine driven accessory,
or damaged wheels/tires.
Vibration caused by a propeller shaft may be the
result of:
• undercoating on the shaft tube
• missing shaft balance weight
• excessive shaft runout
• worn or damaged propeller shaft yokes or
universal joints
• broken seam welds at either end of the shaft
• dents or bends in the shaft
Vibration caused by a yoke may be the result of:
• excessive yoke runout
• loose U-joint clamp bolts or loose pinion nut
• damaged yoke
An incorrect universal joint angle can produce
an out-of-phase condition and cause vibration at
low or high speed.
PROPELLER SHAFT RUNOUT
Measure propeller shaft runout at the center and
both ends of the shaft with a dial indicator.
T h e dial indicator s h o u l d be i n s t a l l e d
perpendicular to the shaft surface and be rigidly
mounted for accurate readings.
Remove all dirt and undercoating from the areas
where the dial indicator stylus will contact the
shaft.
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