Ok been sorting out lots of issues with the drivetrain. I had a clicking left front cv joint, that has been replaced.
front drive shaft 2 years old.
had drive shaft vibration under back seat area so I replaced the u joint and rubber coupler.
so after all of this I still had a bad growling vibration when letting of the gas. But accelerating it went away.
so this morning I pulled the front driveshaft. Took it out and no more noise and vibration. Now this was the first time I had to use a pry bar to pop the drive shaft out.
Drive shaft came from lucky8.
so do I have a bad ring or pinion? Or did I crap another drive shaft?

 

My diff did the opposite. It would make a rumbling/shaking when on the gas and go smooth when I let off the gas.

 

well I thought I might have still heard a noise with the driveshaft out if it was the front diff?

 

It depends on what the problem is. In my case the pinion bearings were toast and only made noise/shaking under input load.