I just starting to have what sounds like a growling noise coming from the front end. It's a 2wd with the 5.4L engine. I've checked the tire pressure and it correct in both tires and I don't see any signs of either front end tire rubbing against anything. Don't see any signs of unusual wear patterns. I had the front-end aligned about 3 months ago. The noise just started happening about 2 weeks ago. It's the loudest between 45-60mph and pretty much goes away around 70mph. Steering seems to be ok and nothing feels loose or wobbly. Any suggestions??? Thanks.