[Grtwhthntr]

The knocking you heard was likely wheel hop or the popping of hitting the rev limiter, in both cases not great. Better plan would have been to stop, switch to second, then rev it up again, that way you would not be so quick to hit the limiter. Wheel hop, if that was the case, can break axles, so best to stop if that is happening. I myself prefer to use these to get through the snow