My 04 has a slight vibration and howling noise at 45 and 60mph. It is 10 times louder in 4 wheel high. Goes away when out of overdrive. Any sugestion before I take it in. thanks, Troy.

I have the same problem, dealer tried telling me it was a cobination of noise frequencies from tire pressure and 4wd gears. Since then it seems to have gotten worse. Let me know if you find anything out, I will do the same.

Thanks
Durajoe