I posted a topic a few days ago about how my truck was vibrating while drivng. First of all, here's the info: '99 Ram 1500, QCSB, 5.2L, 4x4, Auto. This is a long post, but try to bear with me.
After driving around for a few days with the problem, I think I can describe it more accuratly. When I am sitting at a stop, the truck feels like it is vibrating. When I start to move, the vibration gets worse. I cannot pinpoint where it is coming from. Also, it will stop vibrating at speeds about 30-40 mph. When the truck shifts into overdrive, it starts vibrating bad again. When I turn the OD off, the vibrating stops, because the engine is reving, I guess? Now, when I am sitting at a stop,the truck only vibrates when it is in Reverse or a Drive position. When I put it in Park or Neutral, the vibrating stops. Does anyone have any idea what this could be? Since it only happens in certain gears, I'm guessing it is a transmission problem? Any help would greatly appreciated!

 

Any ideas?

 

I'd bet good money you need to look closely at your motor mounts. Don't forget the tranny mount in back.