the day i bought my truck, as i was driving home messing around with everything, i put the rear windows down about 1/2 ways while driving over 65 mph and the truck started vibrating and the wind was making a real deep bass type of sound. it always does it so i don't put my rear windows down anymore. anybody else have this problem.

 

I get the noise too.... Nothing to really worry about though... It has to do with the wind sheer againt the window opening. Kinda like noise made by taking a piece of paper and blowing against the edge of it like a reed except a lower tone because of the window opening. I had the exact same problem in my 4-door Jetta with the windows 1/2 way rolled down at highway speeds. Just roll the windows all the way down or up.

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2001 F-150 Supercrew 4X4 Lariat
Solid Black
5.4L Triton(TM) V8
LT Grey Leather Captain's Chairs
Electronic AM/FM Premium Stereo
Cassette and 6-Disc CD Changer
Trailer Tow Group, Class III
3.55 Limited Slip Axle
Bed Extender
Cab Steps
Skid Plates
and Front License Plate Bracket

Mods: Full Metal Jacket (Ployurea Based) Spray-in Bed Liner. Its Awesome!
Info here: http://www.specialty-products.com/PDF/polyurea/FMJ.pdf

Pictures of the Baby!!!