Why does my truck shake in overdrive?
Why does my truck shake in overdrive? The vibration happens because the power coming out of the engine is not smooth. Every time a cylinder fires, the crankshaft is accelerated. For street rods the magic number for smooth running in overdrive seems to be a minimum of 1,800 engine rpm with 2,100-2,300 rpm at 55-65 mph a good goal. When does a truck shake when under load? The shake usually always occurs at very specific mph ranges. It will first happen around 45-50 mph and again at around 60 mph It also happens when under additional load, such as driving...