I just got this truck and i am already noticing problems. I have a 07 HD with a saleen supercharger...when i am full throttle, sometimes at about 65 mph my truck surges, seems like the supercharger belt is slipping. that only happens occasionally. then when at full throttle at about 80-85mph my front end shakes violently. i mean my hood shakes real bad...any suggestions..im already starting to get pissed and i just got this.. please help.

 

Make sure you haven't thrown a wheel balancing weight.

 

had it balanced?