I had noticed it a little when I turn(either way) and am accelerating into traffic, it seems the rearend vibrates. This weekend we have come to the mountains and to get to our cabin there is a steep driveway to go up too. When I am driving up, it vibrates again. I am wondering if the mounts on something is bad and the turning and uphill accelerating it allowing them to torq up and feel the vibration against the cab. When I am at a stop and I accelerate hard , it won't vibrate. I was wondering if I am getting some axle wrap for some reason. It feels like the vibration is coming from the rear of the vehicle.