The radius arm bushing may wear, causing a clunking or popping noise when driving over bumps. To repair, the bushings need to be replaced. Depending on the severity of the wear, the brackets may also need replacement. Driving with worn bushings will shorten tire life and cause tire cupping (uneven tire wear).
Noise Over Bumps Due to Radius Arm Bushing Wear on Ford Explorer
Average mileage: 145,000 (145,000–145,000)
1 model year affected: 1991
2 people reported this problem
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what is the front upper control arms?
How do I replace the Radius Arm Bushings where it meets the cross member?
I already have the control arm removed.