Hello: 2006 X Off-Road M/T, 111,000 miles, owned since new. Noticed a vibration in the steering wheel and can sort of hear it while approaching 45 MPH in any gear, and it lasts all the way up to 75 MPH. But, if I clutch or coast in neutral at those speeds, the vibration stops. My question is, could this be a wheel imbalance issue since it does not occur when free-wheeling? My initial thoughts were that a wheel bearing, differential, or U-joints are going, but wheel balance would be the easiest fix. Any thoughts are appreciated. Thanks!