Subaru Legacy 2004 Service Manual page 2898

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Symptom or trouble

6. Gear noise

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 jacking-up

all four wheels. Perform these inspections

according to condition of trouble. When

listening to noises, shift gears into four

wheel drive and fourth speed position, try-

ing 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 for hypoid gear.

(3) Scored or chipped teeth of hypoid

(4) Seized hypoid gear.

(5) Improper preload for front or rear

(6) Seized, scored or chipped front or

rear bearing.

(7) Seized, scored or chipped side bear-

(8) Vibrating differential carrier.

DIFFERENTIALS

Replace hypoid gear set.

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