Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 241 (DRIVELINE SYSTEM-GENERAL INFORMATION)DIAGNOSIS AND TESTINGDRIVELINE SYSTEMSYMPTOM CHART

2009 Mercury Milan Premier, 3.0 1, AWD

Symptom Chart

2009 Mercury Milan Premier, 3.0 1, AWDSECTION Symptom Chart

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
Traction-Lok® does not work in snow, mud or on ice	Differential	CARRY OUT the TRACTION-LOK® DIFFERENTIAL OPERATION CHECK . REPAIR as necessary. REFER to REAR DRIVE AXLE/DIFFERENTIAL - FORD 8.8-INCH RING GEAR .
Lubricant leaking from the pinion seal or axle shaft oil seals	Vent	CLEAN the axle housing vent.
	Damage in the seal contact area or dust slinger on the pinion flange dust shield	INSTALL new pinion flange and the pinion seal if damage is found.
Differential side gears/pinion gears are scored	Insufficient lubrication	INSTALL new gears. REFER to REAR DRIVE AXLE/DIFFERENTIAL - FORD 8.8-INCH RING GEAR . FILL the axle to specification.
Differential side gears/pinion gears are scored	Incorrect or contaminated lubricant type	INSTALL new gears. REFER to REAR DRIVE AXLE/DIFFERENTIAL - FORD 8.8-INCH RING GEAR . CLEAN and REFILL the axle to specification.
Axle overheating	Lubricant level too low	CHECK the lubricant level. FILL the axle to specification.
	Incorrect or contaminated lubricant type	INSPECT the axle for damage. REPAIR as necessary. CLEAN and REFILL the axle to specification.
	Bearing preload adjusted too tight	CHECK the ring and pinion for damage. INSPECT the ring and pinion wear pattern. ADJUST the preload as necessary.
	Excessive gear wear	INSPECT all the axle gears for wear or damage. INSTALL new components as necessary.
	Incorrect ring gear backlash	INSPECT the ring gear for scoring. INSPECT the ring and pinion wear pattern. ADJUST the ring gear backlash as necessary.
Broken gear teeth on the ring gear or pinion	Overloading the vehicle	INSTALL a new ring and pinion. REFER to REAR DRIVE AXLE/DIFFERENTIAL - FORD 8.8-INCH RING GEAR .
Axle shaft broken	Overloading the vehicle	INSTALL a new axle shaft. REFER to REAR DRIVE AXLE/DIFFERENTIAL - FORD 8.8-INCH RING GEAR .
Axle shaft broken	Misaligned axle shaft tube	INSPECT the axle for damage. CHECK axle shaft tube alignment. INSTALL a new axle shaft. REFER to REAR DRIVE AXLE/DIFFERENTIAL - FORD 8.8-INCH RING GEAR .

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.