Mechanics

WHAT IS CAUSING MY ALL WHEEL DRIVE TO NOT WORK

1996 Subaru Legacy • 200,000 miles

The front wheels are working properly but the rear wheels will not engage at all what will cause this thanks
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Chadr37
November 24, 2011.



DRIVE AXLE - RWD TROUBLE SHOOTING
NOTE: This is GENERAL information. This article is not intended to be specific
to any unique situation or individual vehicle configuration. The purpose
of this Trouble Shooting information is to provide a list of common
causes to problem symptoms. For model-specific Trouble Shooting,
refer to SUBJECT, DIAGNOSTIC, or TESTING articles available in the
section(s) you are accessing. For definitions of listed noises or sounds,
see DRIVE AXLE - NOISE DIAGNOSIS under POWERTRAIN.
DRIVE AXLE (RWD) TROUBLE SHOOTING
CONDITION & POSSIBLE CAUSE CORRECTION
Knocking or Clunking
Differential Side Gear Clearance Check Clearance
Worn Pinion Shaft Replace Pinion Shaft
Axle Shaft End Play Check End Play
Missing Gear Teeth Check Differential/Replace Gear
Wrong Axle Backlash Check Backlash
Misaligned Driveline Realign Driveline
Clinking During Engagement
Side Gear Clearance Check Clearance
Ring and Pinion Backlash Check Backlash
Worn/Loose Pinion Shaft Replace Shaft/Bearing
Bad "U" Joint Replace "U" Joint
Sticking Slip Yoke Lube Slip Yoke
Broken Rear Axle Mount Replace Mount
Loose Drive Shaft Flange Check Flange
Click/Chatter On Turns
Differential Side Gear Clearance Check Clearance
Wrong Turn On Plates (1) Replace Clutch Plates
Wrong Differential Lubricant (1) Change Lubricant
Knock Or Click
Flat Spot on Rear Wheel Bearing Replace Wheel Bearing
Low Vibration At All Speeds
Faulty Wheel Bearing Replace Wheel Bearing
Faulty "U" Joint Replace "U" Joint
Faulty Drive Shaft Balance Drive Shaft
Faulty Companion Flange Replace Flange
Faulty Slip Yoke Flange Replace Flange
(1) Limited slip differential only.

Rivermikerat
Nov 24, 2011.