Having problems with your 1998 Ford F150 Regular Cab ?

1998 Ford f150 4x4 intermittant clapping sound front axle area

\015 I have a 1998 ESOF 4x4. The 4x4 shifts in and out ok, so it appears. I recently noticed an intermittant ''clapping'' sound from around the front axle when the 4x4 is disengaged. Could this be a result of a bad vacuum solenoid or axle shifter? Applying the brakes sometimes makes it away but not always. Swerving left and right sometimes makes it go away. It returns later. Is the vacuum shifter at the axle a positive pressure to shift in and out or positive pressure to engage and spring return out? What is the best way to figure this out? Its not a break problem. Haven't gotten too far into the checkout, but don't want to drive it for fear of damage to something.\015 Posted / edited by AnonymousUser on : 12-08-2019

Answers :

The vacuum shift motor ( actually a diaphragm ) is a vacuum to move the lever one direction ( i.e. 4WD ) and then vacuum to move the other direction ( i.e. back into 2WD ).

You can shift into 2WD and remove the vacuum lines and plug them to remove this, if you think the vacuum shift solenoids are getting ground from another source and shifting the front axle, or just unplug the connector on the shift solenoids. The GEM activates the Shift solenoids by applying ground to them.
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I would have to agree with papa_11069 that the problem is in the front u-joints.
Your problem seems to be in your front drive axel check to see if the cv boot is torn allowing water to wash away grease it also can be a u joint in the front drive shaft both of these problems would cause the noise you describe especially in between gas and brake causing torque gap.
Repair Help & Product Troubleshooting for 1998 Ford F150 Regular Cab

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