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I noticed the same thing under my 2000 X today while changing the oil. There is another one over the rear axle hanging from a cross member under the bed. Strange. My 2000 F250 set up the exact same way doesnt have those dampeners.
It's a government mandated "roll over prevention" counter weight. The NHTSA felt that a lot of Excursion owners would install lift kits, raising the CG and the possibility of a roll over.
Michael
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.