[70K10Hunter]

you need to post some pics of the cab and bed mounts. looks to be a 12 bolt in the rear and a corporate 10 bolt up front with full time hubs and yes that is an early NP203, If I were to guess the running gear is early/mid 70s. The spring hangers got me puzzled tho, they are under the frame and not mounted beside the frame. Maybe the frame is from the 3100 and the running gear is from a K5??? Another thing or 2 I noticed is the rather large webs/gussets mid frame under the back of the cab.... Also look at the cab step mounts they are secured directly to the frame........I think its the original frame.