Subaru IMPREZA GD 2007 Series Manual page 3323

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Symptom or trouble
6. Gear Noise
NOTE:
Since noises from engine, muffler, trans-
mission, propeller shaft, wheel bearings,
tires, and body are sometimes mistaken
for noises from differential assembly, be
careful in checking them. Inspection
methods to locate noises include coast-
ing, accelerating, cruising, and lift-up of all
four wheels. Perform these inspections
according to the condition of trouble.
When listening to noises, shift the gear
into four wheel drive and fourth speed po-
sition, trying to pick up only differential
noise.
General Diagnostic Table
Possible cause
(1) Improper tooth contact of hypoid gear. Readjust or replace hypoid gear set.
(2) Improper backlash of the hypoid gear.
(3) Scored or chipped teeth of hypoid
gear.
(4) Seized hypoid gear.
(5) Improper preload for front or rear
bearings.
(6) Seized, cut-away or chipped front or
rear bearing.
(7) Seized, cut-away or chipped side
bearing.
(8) Vibrating differential gear.
DI-57
DIFFERENTIALS
Remedy
Readjust.
Replace hypoid gear set.
Replace hypoid gear set.
Readjust.
Replace.
Replace.
Replace.