2006 LR3 V8 w/146k. For the past month I have a vibration/grinding feel in the steering wheel and pedals when lightly on the gas or coasting below 40 MPH along with a slight howling sound. Seems to be getting worse every few days. Both front wheel bearings and DS cv axle have been replaced with no change. Brakes are all good and truck drives straight and smooth. Front diff was replaced with a low mileage unit last fall and was quiet when installed. Rear diff, TCase and tranny are all original but show no signs of excessive wear in the fluids. The driveshaft center carrier has no tears in the rubber and the bearing seams fine. Thoughts?