The newer Ford F-150 trucks have a front suspension
which is slightly lower than the rear suspension of the truck for increased aerodynamic efficiency. This vehicle had been sold new by a local dealership, the customer had a front end leveling kit
installed for visual appeal, then it had a vibration problem. The service department tried several things to fix the vibration but could not fix it. That is when I received a phone call from the service manager asking for help
The service manager described the history of this vehicle including the fact that a front suspension leveling kit had been installed. I learned that in an attempt to repair the vibration
, the dealership service department balanced the tires several times but did not know what else to do to correct the vibration concern.
I told the service manager that the leveling kits would change the angles of the front CV joints on each end of the half-shafts coming out of the front axle. I informed him that CV joints rotate at a constant velocity only when their working angle is less than 50% of the maximum working angle limit. The leveling kits may be causing the 50% limit to be exceeded causing the CV joints to pulsate as they rotate. The only way to fix this vehicle is to remove the front suspension leveling kit.
There were no bad parts on this vehicle, aftermarket parts (the leveling kit) caused the vibration to occur. The unhappy customer has to choose between having a level truck or a tire speed vibration.
Hundreds of dollars were wasted on attempted repairs, many hours of labor were wasted because nobody really knew how to diagnose a vibration problem; they were just guessing!
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