I just bought this truck today with 112k for 1k. It has a axle from another dakota on it so the back sits higher than the front. has good oil pressure good idle...but it has a vibration while accelerating in park or drive. feels like a bad u joint. but there no missfire no codes etc.. the other thing i noticed is at 60mph its at 2k rpms.... I have a theory that this is due to gear ratios.Im attempting to find a new rear end for the truck. When i first felt the vibration it was in drive so I assumed drive line angles a bad hub or a output bearing. However i noticed it does it in park while giving it gas. any tips are appreciated ty.

 

Bad motor mounts? An accessory out of balance or a bent pulley?

Check for a slipping/loose harmonic dampener. It happens.

 

Also check motor mounts,loose bolts make lots of vibration.

 

Thanks for the replys guys. Turned out to be the transmission mount. Transmissions laying on the crossmember. im very happy with a 17$ fix. Now i just need to find a rear end that goes to this truck lol. looks like a rc car right now.