Had crunching noises from front end at low speed when hitting potholes. F53 chassis. Ford service found bad kingpins. Only 5000 miles!. Now into day 5 of repair. Ford service tech was unable to insert new kingpins into bushings supplied by Ford. Apparently, the new bushings and kingpins are not machined together. Tech tried for 2 days to insert. Eventually both knuckles were sent to a machine shop to have the kingpins/bushings machined to fit. Still waiting, but hope to have my MH back today.