One or more of the universal joints are worn or damaged.

Replace the driveshaft complete.

One or more of the universal joints have lost lubricant.

Replace the driveshaft complete.

Rubber coupling bolts loose at transmission or axle flange.

Tighten the bolts to specifications. Refer to Fastener Tightening Specifications .

Bolts loose at driveshaft flange and coupling.

Tighten the bolts to specifications. Refer to Fastener Tightening Specifications .