If you happen to choose the 3800, you can choose to shorten the frame, but I think you might find some difficulty in getting the suspension adjusted for the desired ride height without investing in new springs. There is probably just enough differences that you should probably look into finding a 3600 that strikes your fancy.
If you do move forward with that project, their are many here who would love to get there hands on a complete 9 ft bed. Myself included! Be sure to post any extra parts to the Swap Meet section.
