Rick's Free Auto Repair Advice

Vibration, Chatter, Binding on turns

Ford Vibrates makes chattering sound and binds on turns

Ford has a problem with Vibration, Chatter, Binding on turns in their limited slip differentials in 2002-04 Mustangs, Explorers, and Mercury Mountaineers, 2003 Navigators, 2003-04 Expeditions and 2004-F-150 pickups. The problem differentials vibrate, chatter, and feeling like they’re binding during slow turns. The clutch packs in the limited slip differential are the cause of the problem.

To pinpoint the differential as the cause, place the vehicle in 2WD. That will restrict all the power output to the rear differential. Put the transmission in gear and clock the steering wheel right or left while you slowly accelerate. If you feel the vibration or other symptoms when you do that, you’ll need to replace the clutch packs with an updated configuration. Here are the part numbers: F5!Z-4947-BA for 8.8” rear axles, 6L1Z-4947-A for 9.75” rear axles. Make sure you soak the clutch disks in the Ford limited slip friction modifier (Ford XL-3) for a minimum of 15 minutes before assembling.

If your vehicle has independent rear suspension, you will have to replace the circlips and wheel end nuts with new ones. Even though you soaked the clutch disks in friction modifier, you still have to add a full 4oz bottle to the diff. before refilling with lube #XY-75W140-QL.


© 2012 Rick Muscoplat

Posted on by Rick Muscoplat

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