Question about 2006 Ford F-150

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2004 f150 super cab auto Trans with shift on the go. Got under the truck and left side front axle would turn by hand right would not. Are the hubs spring engaged/vacuum disengaged? If so does the entire hub need to be changed?

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

If one side locks and the other does not, I would say it could be 1 of 3 things.

1. The vent tube from that IWE is plugged ( won't let the vacuum in the system bleed off ). Check by blowing through the vent tube or use a vacuum pump to make sure it is open. Watch that you do not have water or something in there, to damage your vacuum pump.

2. The IWE solenoid is not closing on that side. Check the vacuum on the malfunctioning side, that it bleeds off by unplugging, and hold your thumb on it, while shifting into 4H or 4L, you should feel the vacuum release.

3. The spring in the IWE is not engaging the hub. If you remove the vac line from the IWE ( with the engine off ) the hub should lock into place. If not I would suspect a bad IWE.

Have you heard a grinding noise while in 2WD ? If so, the gears on the IWE could be rounded off ( guess that makes 4 things ).

Here is a block diagram of the IWE system to work with the testing.
2004 f150 super cab auto Trans with shift on the - 5f21a04.jpg

Posted on Dec 11, 2009

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