So let me run this one by you guys. My truck's vibration problem appears to go away when I have a passenger.... Anyone have any clues as to how that can be?
Is it a feel, hear, or both type of vibration?
Weight on the seat could close the gap on something in the seat. The entire truck will shift to the passenger side changing angles in the suspension, but not sure why it would change a vibration. Maybe something in the exhaust is just barely contacting. Are the heat shields tight?