Those are for pickups. A 4000 is a 2 ton truck, the body sits much higher above the engine and transmission. His C50 is a big bolt also. All the GMC and Chevy medium duty trucks from 60s and 70s that I drove had an almost flat floor. A straightedge across the transmission cover on my 4000 is only 1 3/8 inches above the floor level. Here is the previous discussion on it: https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=543399&page=2

Some pics of big bolt floor: http://rides.webshots.com/photo/2930912880104602464raUYFU


Last edited by ScottGMC40001964; 04/16/2010 5:56 AM.