Probably needs an "iwe" solenoid.
iths the vacuum solen oid that controls the 4x4 vacuum hubs,
they leak vacuum and cause partial engagement of the hubs.
thats probably the noise your hearing.
i think ford has a tsb 06-08-15
6L3Z-9E441-A
IWE Solenoid
if it is squeaking only when turning, it may be a base brake issue.
i would inspoect the pads and calipers closely, possibly removing them, if there was nothing found switch pads side to side on front and retest.
did the iwe solenoid have problems for a while?
possibly thew vacuum actuator coulod have been damaged.....
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I have a 2004 f150 fx4 and i just had the iwe solenoid changed, also when i turn right there is a squeeking sound but only when i turn right and ford said they could not find out the problem and 500 dollars later its still there, any ideas of what it might be?
Try spraying some silicone spray on the CV boots. In sharp turns the folds will rub against each other and if dry they squeak. Just turn the steering wheel, jack the tire off the ground under the suspension and spin the tire by hand to check for this. It worked for me.
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