I have the exact same problem but my Left side is "Lower" than the right side.... Go Figure, Let's switch Solenoid's... Lol. I haven't seen a fix for this yet... there is 1 ride height sensor bolted to the rear but it's for both sides. the following site seems to be recommended by most Expo owners on all of the ford forums.. Check them out. http://www.suncoreindustries.com/english-ford-expedition-97-02-air-suspension.html
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Re: 1998 Expo Lop-sided rear suspension
Both rear solenoids fill and vent together as one if the vehicle has a leaning concerning it is probably a front concern.It could be an air spring leak or there is an equalizing solenoid or it could be a broken torsion bar
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A sway bar is a suspension piece that keeps the left and right side of vehicle connected to help with turns. They are held together through sway bar links at each end, which are fairly common to break or rattle over bumps.
If you have the coil spring suspension, then your spring for that corner has really sagged[doubtful] I suspect you actually have the rear air suspension ,and the air spring for the Right/Rear has lost air, allowing the rear end to lower down greatly. Usually, you need a new air spring when one develops a leak. You may or may not be able to see the leak with a spray solution of soapy water after the spring is removed for inspection. Sometimes you have to apply about 20psi of air pressure into the spring to inflate it a bit, then put the spring under water in a big enough tank/tub of water to catch the leak that way.
REAR WHEEL ALIGNMENT TOE-IN: 0±2 mm (0±0.08 in.)
The rear suspension lower arm mounting cam bolt should be turned an equal amount on both sides during adjustment.Right wheel : Clockwise direction : toe-inLeft wheel : Clockwise direction : ton-outMaximum difference between LH and RH : 3mm
The cam bolt should be adjusted within a 90° range left or right from the center position.CAMBERStandard value : 0°±30´Maximum difference between LH and RH : 3mm: 0±2 mm (0±0.08 in.)
The rear suspension upper arm mounting cam bolt should be turned an equal amount on both sides during adjustment.
Install the left and right springs which have the same identification color.
The cam bolt should be adjusted within a 90° range left and right from the center position.
1.Measure the tread depth of the tires.Tread depth of tire [Limit] : 1.6 mm (0.06 in.)2.If the remaining tread depth is less than the limit, replace the tire.When the tread depth of the tire is reduced to 1.6 mm (0.06 in.) or less, the wear indicators will appear.