"SAGGY [non-permissible content removed]"? My '97 Expedition E.B. 4X4 has the common problem. ALLOT (A WHOLE LOT) have at the Right Rear. My Air springs appear fine (per viewed pictures and a soap/water spray narrowed it down to the area of the "SOLENOID". I am going to replace the $ 25.00 solenoid before the $100.00 air springs hoping that works.
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GO to Arnottindustries.com web Site below is typical removal / Installation instruction
https://www.arnottindustries.com/file.asp?Manual=TRUE&ProductID=41&Size=SMALL