Ford F-150 IWE Vacuum Delete Wheel End Coupler Pair 600-405

This is a pair of Dorman OE FIX 600-405 independent wheel end couplers, one for each side, sold as the vacuum delete for Ford's IWE (integrated wheel end) system. It replaces OE hub actuator 7L1Z-3C247-A.

Fitment: 2004-2014 Ford F-150 4WD, 2003-2015 Ford Expedition, 2003-2015 Lincoln Navigator and 2006-2008 Lincoln Mark LT. Confirm your hub style before ordering.

The problem it solves: on these trucks the front wheel ends are engaged and released by vacuum working on a diaphragm inside each IWE. When that diaphragm tears, or when a vacuum line, the check valve or the solenoid leaks, the hub is left partially engaged. That gives the familiar grinding or ratcheting from the front wheels in 2WD, especially when accelerating from a stop, and 4WD that engages late or not at all. The Dorman coupler removes the vacuum diaphragm from the job, so 4WD works without depending on vacuum.

The change is reversible. Vacuum caps are included to seal off the remaining lines, so the original IWE setup can be restored later. On install: raise the truck and remove the wheel and caliper. Unbolt the old IWE from the knuckle, clean the mating surface, install the coupler with its seal, and torque the bolts to spec. Cap the vacuum lines to that wheel, then test 2WD and 4WD engagement on the road.