Has anyone out there swapped a 55-59 chevy truck sheet metal onto a later model chevy frame and running gear?My wheel base is 114 inch's.  

Many have done this swap....  But it requires a lot of work to make all the brackets and mounts.  And the later frames were a lot different with a raised section in the bed that is quite different from the "flat" 55-59 frames.

Add to this the front part of the frame on the newer trucks that tends to be narrower and have a more "Y-shape" to them.

My question is... What are you looking to *** put it up in the air, or go 4x4 or what?

If it is a smoother more modern ride, then the installation of a modern IFS like a Mustang II clone and a rear end swap would be the way to go.  That way you can lower the truck or stay at stock height.

Plus a new IFS is engineered for the 55-59 truck frame, and provides disk brakes and coil over or full Air Ride if you choose that option.

If this is your first attempt at something like this.... Do your self a favor and do a lot of research first, look at many articles and talk to lots of guys who have these truck and then you can make an informed decision.

What you are asking to do, is not for a novice by any means.

My 2-cents worth,
rico_bob  

I have a 55 GMC I put on a 72 C-10 chassis. Made new cab mounts and bed mounts. Same wheelbase just offset more towards the front.  

You hit the nail on the head with your reply, rico Bob. Sounds like you probably do a lot of this kind of work yourself. I would have told him the same thing.