IOWA — An Iowa State Patrol Commercial Motor Vehicle Unit trooper conducting a routine roadside inspection recently discovered significant movement between opposing yoke ends of a truck’s driveline, a failure that experienced drivers in the trucking community say should have been impossible to miss and could have had catastrophic consequences on the highway.
CVMU noted the find is relatively uncommon but presents a significant safety concern. The truck was placed out of service.
Drivers who saw the post were quick to weigh in from experience. Several said the movement visible in the photos would have produced severe vibration and clunking the moment the truck started moving. One driver described a similar failure of his own: a front U-joint that went out around 45 to 50 mph with no warning, causing the truck to hop several times before he could react. “Never made any tell tale noises just decided to go,” he wrote.
Others pointed to the more alarming scenario, what happens when a driveshaft actually lets go at speed. “That cotter pin is about to go. If that pin fails that drive shaft is going to detach and is going to pole vault the truck,” one commenter wrote. Another put it plainly: “I always wondered how driveshafts ended up laying about randomly on the highway. Can you imagine that bouncing up and through a car’s windshield?”
The find serves as a reminder that pre-trip inspections exist for exactly this reason. A driveshaft failure at highway speed is not survivable for everyone around it.
Community accounts courtesy of trucking professionals.
📸 Image(s) used under fair use for news reporting.
