Okay so I bought the truck a couple years back and I've only put about 5k miles on it and shortly after I noticed that at 50mph and from 70-75 only in the passenger side rear after about a month of owning it I decided to contact rocky at chaotic rods and customs about some work so skip forward now the truck now has a 5/8" drop on 26" dub ballers...the parts are control arms and spindles with all new ball joints and tie rod ends the rear of corse is a flip kit with shackles and new shocks....and now it's crazy...still at 50mph and 70-75....the truck is tuned so I tried running it out and from 90-140 it's smooth....I've balanced the tires 3 times as well as rotated them and have now replaced them...if it doesn't stop my truck is going to shake apart Please if you have any advice or help or know of a fix please let me know.