I have the same type of problem on my 2002 crew cab dually. Dealer would not look at the problem unless I removed the bug/wind deflector off the front. Since that was not going to happen I will have to fix myself. Which I have yet to do.
I found the problem by doing a road test with a friend. We taped everything under the hood and then I put tape between the windsheild and the molding on the PS. Wind noise GONE!
I had to have electrical tape on the front window forever but I also hate to put caulk on it.
Try the tape and see if that fixes your problem. I would be interested to see if it does and what your dealer will do to fix. I have 40k on mine now so I will fix the minor stuff myself or be charged 100 big bucks for a dollar problem.
Please let me know.
2002 Green Chevy, duramax/allison, crew-cab 3500. Pulling a 36 foot, triple axle, triple slide, Travel Supreme fifth wheel. I run B2 bio-diesel most fillups.<br /> <a href=\"http://photos.yahoo.com/duramaxscott\" target=\"_blank\">http://photos.yahoo.com/duramaxscott</a> <br /><br />Only mod, soon to install Allison deep pan.