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hubs clicking drive shaft

  1. Front end CLUNKING Helppp!!!!

    Suspension & Steering
    2002 F250, 8 inch lift w/ 37's Manual locking hubs Ok so my truck has no issues in 2wd even with hubs both locked or when in 4x4 hi/ low with hubs UNLOCKED. BUT as soon has 4x4 system is in action as I idle forward there's a massive clunking and binding sound like a sledge hammer bouncing off...