I've got an 09 H3T which I am currently experiencing a problem with that I hope someone here can help me. The truck has about 1500 miles on it now and about the 1000 mile mark I started to experience a pretty noticeable vibration in the gas pedal when the rpm's climb to 2500 to 3000 range. The vibration is felt through the floor boards seats, steering wheel and shift lever. Only does this when the vehicle is under load. If I let off the gas vibration disappears. I've got the in-line 5 with automatic trans. It has been to the dealer once so far for this, they adjust an exhaust clamp and installed anothe rclamp and hangar that was missing, so they say. Anyways it is going back to the Dealer this coming monday. Anybody have any Ideas?

 

possable loose engine mount ot warped drive shaft or bad u joint