Loose U-bolts.

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

Loose or worn eye bushings.

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

Lack of lubrication.

Lubricate as required.

Faulty shock absorber.

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