Floor Mounted Shifter Vibration

[dudleykid]

I have a vigorous vibration on my floor mounted shifter at 65mph. This weekend I got my tires balanced, replaced my u joints, and tightened down the bolt in the cab that holds my shifter in the housing compartment. It still vibrates. I took it to a mechanic and they determined a bent driveshaft. Next, I took the drive shaft to a drivetrain specialists, they recommended building me a custom driveshaft since the other shaft was unfixable, and (from the receipt) balanced the driveshaft (not sure if the new or old driveshaft was balanced). The vibration is exactly the same at the same speed. Where do I go now? I am going to head back to the drivetrain specialists shop. I have a 2006 2500 Silverado 6L V8 Ext cab.

 

Sidenote: A muffler/exhaust system that was not tight could shake around, but it would rather shake my truck as a whole and not just the floor mounted shifter, correct?

[dudleykid]

I replaced the transmission mount today. It did not fix the vibration.

[mike101010]

I have the same issue can't figure it out replaced a bunch of stuff hope you have better luck