I just had my Flywheel, Throw out Bearing, pressure plate and slave cyl replaced under warranty. I have a 2003 2500HD 6 speed with only 15,000 miles. Now it is starting to make a whole different noise. It only makes it in 5th and 6th gear when I have the pedel to the floor. Its like a grinding noise that sounds like its coming from my dash. Last night I put my truck in 4 hi and it makes the entire truck shake, it feels like my truck is about to fall apart. It makes the sound in both 2hi and 4hi it just is 10 times worse with it in 4hi. Usually it makes the sound in 6th gear around 40-50mph. Anyone know what this could be????