ive swapped beds on my truck but it was a little more involved because it was a long bed and we cut the frame down and put a short bed on it. the only thing we had to change was gas tanks because the long bed tanks are too long for a short wheel base. we unbolted the bed and slid it back and flipped it upside down off the truck. we laid the other bed upside down, backed the truck up to it and flipped it over. the bed came off of either a 75 or a 76, not sure, but i put it on an 84.