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^^agreed anything over a 3500 was considered a topkick/kodiak. Although there were some trucks that appered to have a body lift and had a body filler between the bumper and the grill. Not sure if they were a 4500/5500 or just something they did on 2wd 3500s.
http://imgc.classistatic.com/cps/poc/130304/493r1/45325g9_27.jpeg