I ran All Terrain T/A KO/KD's for a while on my 350 ford and when new, they were reasonably quiet but as they wore they got louder and louder. The other thing I noticed was, as they wore in, the tread started chunking a bit. I live in a dirt / gravel road, that may have had something to do with it. The howling didn't bother me, but the tread chunking did and the what I consider poor treadlife did. I put 40 K on them and they were shot.
I now run Michelin. Same price, much quieter and looks like they will wear longer too,
