Question about 2006 Ford F-150

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Grinding noise I have a 2006 ford F150 4x4 and I'm getting a grinding noise like 2 gears aren't meshing when I take off from a parked position only when the vehicle has been warmed up, starting off cold it doesn't happen and when it does if I stop and put it in reverse it stops, Any Idea's thanks

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I am going to guess a bad vacuum line some where in the 4x4 hub system.

Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.

I get the bad vacuum line ( or vacuum box ) from the fact that the problem happens after vacuum has been applied to the IWE to pull the spring out. I would also guess this does not happen when in 4H or 4L.

Here is a vacuum block diagram of the IWE vacuum system
Grinding noise - e000ccf.jpg

It could also be the IWE vacuum solenoid, there is a TSB on this ( right click save as ).
http://my.voyager.net/~sscully/file_tsb06_08_15.pdf

Posted on Jul 24, 2010

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