If it has "6400" emblems, someone has switched them out in the past. All 6000 series (6100, 6400, & 6500) trucks are conventionals. All COE trucks are 5000 series. Should be either "5100" if 110"in. wheelbase, "5400" if 134"in. wheelbase, or "5700" if 158"in. wheelbase. Trust me, I've owned close to thirty of them the last 25, or so years. What does your ID tag in your driver door jamb say?
