I'm thinking Dodge Power Wagon in this case:

M-37, or something else?


For this one:

I'm going to need more details than just the rear end. But it could be anywhere between a 1961 and 1968.

Here's another reminder of the numbering and lettering of I.H.C. pickups and light-duty trucks:
http://forum.imcdb.org/forum_topic-4345-International_Harvester_Trucks.html