SOURCE: The rear suspension on my 2006 lexus gx470 is
The upper part of the struts have a bearing in them and they are known to generate noise when they seize or wear out,that would be the first place that i would look.
SOURCE: how to change rear air suspension on 1999 ford
The air suspension can be a tricky thing to mess with. When we were looking to replace just one of the rear bags it was going to be costly. My husband did some checking around online and found Strutmasters.com.
They offered great products at a great price and we were very pleased with the outcome of the replacement of the non air system. If you are replacing the entire system you are looking at a pretty penny. I would check Strutmasters out before you replace the air on your Expedition.
SOURCE: how to change rear air suspension on 1999 ford
Change the air suspension to a non air conversion system from Strutmasters. Their kit will save you lots of money and time. Check them out!
SOURCE: Noises in the front end suspension/brakes
I don't belive the axles are your major problem or concern. Sounds as though the diff bearing is going out, it's a fairly common problem. If your trans is the 604 (common name) a slight whine is normal from the transfer gears on that side you will also hear a racheting type noise from the solenoid block when it chamges gears. Get under vehicle and grad cv axle inboard joint, try to move it up and down, some movement is normal but should not be alot. You didn't mention how trans works?
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