Hello all I'm new to the forum site mainly because I'm new to dodge as of last week and every thing else I have is GMs. I have looked on here and haven't found my problem the ones similar I saw where with gas engines if I missed it sorry I tried not to start a thread. Here's what I got going on.

2006 dodge ram 3500 4x4 5.9l diesel auto trans 230k miles quad cab long bed, I have a vibration in the cab/seat in overdrive. when driving and it shifts into od it vibrates it stops when you press the accelerator or let off or push the tow it stops its only when the accelerator is at a position that maintains speed. I just changed the u joints and center support Bering in the rear shaft and its still the same.
what could it be?

 

Possible you have a torque converter issue. Or the trans may need work. Have you checked the condition of the fluid. Color should be bright red. Smell. Does it smell burnt. Maybe do a pan drop to check for excessive clutch material. Filter condition. You could try a service, may or may not help.