As I posted in a previous post, my S10 has a vibration but only when a passenger sits in the passengers seat, other than that it has a knock below the drivers seat. Now I know these things; the back u-joint is slightly worn, the tranny mount is worn, the front right shock obsorber needs a bushing. Now today I got under the truck and realized the cross bar that has the tranny mount on it is missing a bolt on each side and only has one bolt on each side, I can also wiggle the tranny enough underneath the truck to hit the underside of the cab of the truck to make the knocking noise I hear inside the truck. My question is would these things cause the vibration only when a passenger sits in the truck, and do you think I have correctly diagnosed the knocking and vibration problems?