Loose U-bolts

Tighten to the specified torque. Refer to Fastener Tightening Specifications in Rear Suspension.

Loose or worn eye bushings

Replace the eye bushings. Refer to Leaf Spring Replacement in Rear Suspension.

Lack of lubrication

Lubricate as required. Refer to Recommended Fluids and Lubricants in Maintenance and Lubrication.

Faulty shock absorber

Replace the shock absorber. Refer to Shock Absorber Replacement in Rear Suspension.