I would be a little worried if I were you. I had the G80 in my truck for awhile with the blower and it started to do the same thing. One day under a hard straight acceleration, it blew up to pieces and took out my gears too. The situation similar to yours went on for about a month or 200 miles.

I think you are really pushing your truck with the power you are making. Running 12.70's is probably around 450-500 rwhp. I hat eto see what happened to me happen to you.