Definition: A ping, snap, or click is usually heard on initial load after the transmission is in gear, either forward or reverse.

Upper and lower control arms have loose bushing bolts.

Tighten the bolts to specified torque.

A loose fixed yoke or companion flange

Tighten bolts and pinion nut to specified torque.

Worn or damaged universal joint

Replace the propeller shaft assembly because universal joint is not serviceable.

The driveline vibration is at 80 km/h (50 mph)

Inspect the propeller shaft for runout.