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It could be the tire. I spent years trying to get rid of such a out of round or unbalanced feel on my 83 1t. Turned out to be a mis-punched lug bolt pattern in a stock steel wheel. Mounted on a balancer the darn thing ran true as gold, but mounted via wheel studs the thing jumped enough that you could see it plain as day. A tech spotted it with rear off the ground rotating the wheel and brought it to my attention. Ran that rim for some ten or so years before finding it. Yikes. Also a word on balancing. I had a reputable shop (S_ _rs) balance a set of new tires once and had to have it redone three times before they admitted there weights would not stay on my rims, and gave my money for the service back. I documented all weights on all sides of the rimes after the first balance to check at a later date. But with in the first "few" miles I could feel things just not right. So I referenced my notes and found several weights( more than five) had ejected from the scene. They try-ed two more times and gave up. Another shop had the proper weights and they stayed well. Death wobble seems to be a much different animal. I dont have any first hand knowledge of it though, other than reading its threads here. Best wishes.
Rezvani's Latest Post-Apocalyptic 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.