Around 50-60 ONLY WHEN I ACCELERATE I can feel the car shaking from under my feet mostly, no steering wheel shaking, I just got a tire balance and it helped a little bit but could it be bad CV axles or mounts?

 

lower compliance arm bushing

 

there are a few threads on this, but in my case this was the CV joints binding under load.
replaced both drive shafts and problem want away completely.
At first I was hesitant to blame the CV joints because I expected them to clunk (that was my experience in the past) but with the TL they didn't make any noise at all, just the vibration under load. As soon as I let go of the accelerator all vibrations stopped.

 

The same thing is happening to me under various speeds. Is there any way to check the CV joints?