There are certain things that happen in motorsports that no one sees coming. This was one of them for the guys who built and campaigned this cool Ford pulling truck. As you will see, this is a scene that outside of someone getting hurt, could not have gone worse. The rig looks awesome, it seems ready to do battle with the big weight box hanging off the front, the pulling tires on the corners, and a worked up diesel engine under the hood, then they hook the sled to it.
The truck gets off the starting blocks and while struggling to get the load moving, it starts to bounce. Bouncing in pulling is the equivalent of tire shake in drag racing. It can turn an otherwise good hook into a failure and it can certainly break some parts. The reasons are the same in both instances. Loading and unloading the axles, chassis, and engine in rapid fashion is not a recipe for longevity. As this guy found out, it’s also the ultimate test for the fabrication of your pulling truck.
Long story short, the axles effective rip themselves out from under the truck.
The slow motion replay shows how bad the bouncing was even for its short duration. The rear axle is way off the ground and the front was definitely “light” before it failed. As the truck is sitting still you can see the rear driveshaft lying on the ground. Crazy.