It snowed here in Montana the other day and I put my truck in 4 wheel high, at about 15-20 mph the howling started and got louder the faster I went, I get no noise in 2 wheel though...any thoughts or comments, it all works fine, its just a lot louder than I think it should be. Brian '65 D1200 4x4 345 4bbl 4.11 the "taxi" Missoula, MT