This is kind of a long post so please bear with me. First I purchased this car for very cheap, is a 2012 3.7 and I paid $1,300 for it. According to the owner the clutch was gone, which I can confirm it was. Well I towed the car home, order a new Ram Clutch kit w/Billet steel flywheel from LethalPerformance and got it installed. After going for a test drive I notice car has a bad vibration which gets worst as RPM's increase, is not drivetrain related as if I leave the car in neutral and Rev it the vibration is there as well is kind of a vibration/rumbling feeling. I went ahead and changed the following: Harmonic Balancer Motor Mounts Transmission mount The vibration is still there and is very strong, I have been trying to find out what it is but am at at a loss at this point of what could it be, Some say it can be bad main bearings in the motor, but the motor doesn't make noises and the oil is very clean with no metal shaving whatsoever. Have anyone here experienced something similar and found a solution with their 3.7's?