U-bolts!! Check them for proper torquing. Ours were virtually finger tight, probably less then 10 pounds clamping force vs spec of 60 for1/2" (90# on 9/16") u-bolts. The spring center bolt is supposed to ensure that the axles stay in the proper location, but....
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Dave W
2014 Montana High Country 343RL (Sold!)
2011 Ford 6.7 Lariat CCLB (Went to PU Heaven)
2019 F150SC XLT SE Sport,w/full tow package
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