Subaru Legacy 2003 Service Manual page 2769

DRIVE SHAFT SYSTEM
7. General Diagnostic Table
A: INSPECTION
NOTE:
Vibration while cruising may be caused by an unbalanced tire, improper tire inflation pressure, improper
wheel alignment, etc.
Symptom
1. Vibration of propeller shaft
NOTE:
Vibration is caused by propeller shaft during op-
eration and is transferred to vehicle body. Gener-
ally vibration increases in proportion to vehicle
speed.
2. Tapping when starting and noise while
cruising, caused by propeller shaft.
GENERAL DIAGNOSTIC TABLE
(1) Worn or damaged universal joint.
(2) Unbalanced propeller shaft due to bend or dent.
(3) Loose installation of propeller shaft.
(4) Worn or damaged center bearing and damaged
center mounting rubber.
(1) Worn or damaged universal joint.
(2) Worn spline of sleeve yoke.
(3) Loose installation of propeller shaft.
(4) Loose installation of joint.
(5) Worn or damaged center bearing and damaged
center mounting rubber.
DS-38
Possible cause Remedy
Replace.
Replace.
Retighten.
Replace.
Replace.
Replace.
Retighten.
Replace.
Replace.