to start just got the truck 2 months ago 07 cc 5.9 auto ... truck had the 70 + vib figure its a u-joint no biggie these trucks have u-joint issues from what ive been reading.... 45000 miles BTW seems time... changed them no fix ..did a trans fluid ,filter change adj. bands front one way out...took off inspection plate with truck running and low and behold the flywheel is bent and wobbling back in forth....ANYWAYS what do you guys think caused this ......cranked up tuner....or what.. Thanks in advance for your help.