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So I have a 6” lift on my 2010 Ford F-150 platinum. I have 35” Nitto ridge grapplers with some Moto metal rims. I just got my alignment checked out, tires rotated and one tire rebalanced. My truck shakes SO BAD at 70+ mph. I mean the shaking is so bad that my passenger seat rattles and everything in my truck gets shaken up. I even get bruises on my hips from the seatbelt rubbing. Any thoughts or tips before I start spending money on stuff that may not help?

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    Welcome to Motor Vehicle Maintenance & Repair! It sounds like death wobble. I wouldn't know what causes it in a 2010 F-150, but it usually happens with lifted trucks with worn out steering components. May 11 '20 at 1:33
  • If you want high speed stabilty then lowering is better, if you want better rock crawling ability then lifting is better. One reason why F1 cars don’t do off-road very well.
    – Solar Mike
    May 11 '20 at 4:45
  • You could also check your tires for cupping. I don't know how old the tires are or what type but I've seen many lifted trucks have off-road tires the require replacement due to cupping.
    – Techlord
    May 11 '20 at 16:59
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You will need to check each and every bush, steering or suspension joint for play - they will need to be absolutely perfect as any play will be multipled due to the lift.

Also checking all mounting points for steering components etc.

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