Shackles or Blocks
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How many miles on the truck? I know some trucks that run blocks are having a bad time with axle wrap. I would invest in shackles. But if you want to try blocks that will work also and will be cheaper. But if you start getting axle wrap swap to shackles. I didn't on my 97 F-150 w/6" lift and 3" body lift. Had to buy new gears. OK I see you r running 35's, sorry, block it.