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4x4 or front hub noises

3478 Views 2 Replies 3 Participants Last post by  Locked F150
What is causing my front hubs to make horrible ratchet like noise that will only stop when you engage the 4x4
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Auto hubs or manual?

Typically noises like that are a result of the hubs no completely disengaging. That could be a vacuum leak within the integrated wheel end (IWE) system.
look at the iwe actuator on both sides for corrosion. pull the vacuum line off and use a vacuum tool on the bigger of the two metal tubes coming off the actuator. pull a vacuum on the actuator and see if it hold a vacuum. if it leaks you need an actuator. if not then you need to inspect the rest of the system. just make sure that you flush the lines with air before installing a new actuator. also check the two check valves in the vacuum lines to see if they are working.
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