2008 Dodge Charger vibration

Wheel steering vibration. Started 8 months ago. Back and forth to dealer ship, no luck, I am giving up.
vibtation started suddenly, no symptoms. I had aftermarket wheels at the time. They told me the after market wheels is the problem, they suppose went out of shape. So I replaced them with original 20" dodge rims. Problem still exist, exactly the same at 60 miles hr as always never before 60 miles hr.
so they told me its the tires so I replaced them with new ones, and after balancing again, still exactly the same at 60 miles hr and up. They checked all suspension components, they said it was fine. The only thing they replaced was tie rod had little play in it on passenger side, but that did not fix sever steering wheels vibration. Balanced the wheels over 20 times at different shops, no improvement.
the only thing I noticed, that car will drift slowley to the right at high speeds 40 and over always to the right, never to left. Offcourse they aligned it 2 times, still drifted to the right, I even inflated passenger tire to 50psi and deflated the other to 25psi and still drifted to right, my steering wheels is always straight. Which is aligned. No noises or clunks from suspension, very smooth on hard roads and bumps. Please help. Very very bad steering play.