Question about 2004 Ford F150

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2004 F150: When in 2wd the front end makes a noise like a rat...

When in 2wd the front end makes a noise like a ratchet turning backwardswhen I put it in 4wd it stops.this truck has 60400 miles on it.thanks

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I had this problem too. It could be a few different things but all the same result, loss of vacuum causing the 4wd to start to engage but not completely. The teeth on the clutch in the locking hub are grinding on the spline of the cv shaft as you lose vacuum and it tries to go into 4wd which is the default if everything would fail. 1st thing could be either of the 4wd locking hubs (approx $200 ea., located on the back side of each front spindle), check them to make sure the vacuum lines on the top of it are still attached these require the brakes, tie rod and upper ball joint to be removed if replacing, 2nd is the 4wd vacuum actuator (approx. $40 located on the firewall passenger side behind the battery) Ford has replaced this part with a modified one that has a little roof on it to stop the water that drips of the hood when it rains and makes it short out, this is very easy to replace (2 nuts) and last if both the above are working just fine would be to trace all the vacuum lines for a break unfortunately it is a 6-8 foot line for all the front 4wd and it costs approx. $100 if you have to replace. Not very difficult just time consuming. Hope some or all of this helps.

Posted on Jun 05, 2010


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Vacuum reservoir
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The IWE system uses vacuum hubs that engage the front wheel hubs to the front half shafts or disengage the front wheel hubs from the front half shafts.

The IWE solenoid receives engine vacuum from the vacuum reservoir.

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