Wind noise FIXED!!!!!
If your experiencing a "tea kettle" type of whistle that usually starts around that 40 to 45 mph and doesn't go away. It usually changes with the recirc button, but doesn't really go away. The sound seems to be coming from the dash windshield area.
Before we found the actual problem here's the things we tried with no success: Replaced windshield, Replaced recirc actuator & door, Replaced Cowl vent panel, Tried caulking & sealing around windshield.
If this sounds like your truck it sounds crazy, but try this:
Inside the cowl panel on the drivers side, there is a seam where the two layers of metal meet. We trimmed off the "spray foam" around the plastic plug and used seam sealer to re-caulk the seam and around the plastic plug. Once it dried, we put the cowl vent panel back on, went for a drive, and NO NOISE!!!!
Hope this helps at least one person out there struggling with the same annoying wind noise that has been driving us nuts for months!
Here's some pics: