The OEM balancer is almost a 2 piece design, the main part attached to the crank pulley remained, but the outer ring started spinning free. It also took out my timing cover as it was spinning. I was driving down the highway about 70 mph when it happened. it shook the car so bad I could hardly grab the shifter. I pulled over and had the car towed home. i then replaced timing cover, balancer and put it back together, only to hear a knocking sound at 3000rpm.. It only took one missed shift to
completely seize up the engine. It filled the entire highway with thick white smoke and spanned at least a mile.
When the piston came up it took out one of the heads too...