Result of downshifting to first gear at high speed - GIF

[hemmjo]

I used to wrench for a large landscape contractor. They were located down a steep grade off the highway. One day I heard the big old dump truck returning from picking up a load of gravel.

The driver pulled in off the highway in low gear but never bothered to shift heading down the hill. Which would have been ok had he used the brakes to help keep the speed down. Instead, he pushed the clutch in. You know that sound of a turbo spooling up. Imagine that sound X 100 as the straight cut gears in that old transmission spooled up til they just could not take any more!!

Oh what a mess that was.