F81Z-3C124-AA Front Axle Locking Hub Vacuum Line Tube 4×4 Compatible with Ford F250 F350 F450 F550 Super Duty 4WD 1999-2004, Excursion 2000-2005 4WD – Solenoid Harness Replace# F81Z3C124AA. Installs directly in place of the original vacuum tube with no modification required, restoring correct operation of the front locking hub vacuum system.
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