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I just bought a 98 F250 (4x2) with air suspension. I was driving down a smooth road a couple times and the rear end started jumping, building up to almost dangerous between 40-50mph. I tilted my mirrors down and it didn't appear to be the wheels jumping.
I stopped, then went again this time getting up to 60 with no jumping.
This suspension seems to keep settling down and having to pump back up so I suspect some kind of leak, but the jumping seems really strange.
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.