I'm getting worried. When I get the accelerator at almost 3/4 way to the floor, there is a loud growl / grinding noise coming from the engine. I can also feel the pedal vibrate very badly. It does it anywhere from 3/4 to WOT. It isn't getting any worse, but it's scaring the mess out of me. The thing is, it does it about half the time that I'm driving (about 75-80 mph)
Maybe it's just the mighty Cummins rattling along. I just don't know.
Any suggestions would be nice. It's not a huge concern, but I'd like to know what it is. Something to maybe ease my mind.

Any suggestions would be nice. It's not a huge concern, but I'd like to know what it is. Something to maybe ease my mind.

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