Joined a few weeks ago but just now getting time to say Hello. I have an 01 3500 Duramax Extended Cab Dually (well started out with the Dually bed but when it is 20 degrees outside those fiberglass fenders don't like tree limbs to well.) Now has a Bradford Built 8' Bed on it. Only modifications have been a Bully Dog Air Box, and Bully Dog 4" Exhaust. Has about 62,000 miles on it and has already had to have one flywheel. The clutch has started poping when you push it in and let it out so I have a sneakin' feeling that she is on her way out. I have not had any problems pulling my goosenecks before but have a feeling may start before long.