I have a 2010 Hyundai Elantra Blue with man trans, and I have a significant vibration in my steering wheel when cruising at above 50mph. It will put my hands to sleep after about 1/2 hour of driving. I had tires/wheels force balanced - but no change. Funny thing is that, when I'm cruising and I push in the clutch and coast - the vibration goes away. That makes me think it coming from somewhere in the power delivery system upstream of the clutch. Dealer says there's no problem - but I have a 2010 Elantra GLS with auto trans and it doesn't have this vibration. Whatcha think?

 

Yes, you do have a problem. It could be an alignment issue that is only there under power, when the wheels are pulling the car. When you push the clutch in the car is then pushing the wheels.