[mr48chev]

Unless you just flat don't have a good stock frame you have to figure in the total cost of swapping frames and it isn't cheap if you use the kit.

!500 + for he kit by the time you get the extras you figure you need plus shipping.
500 to ??? for the S-10 donor most of the time as the days free dead S-10 long beds out of someone's back yard is long gone.

100 + for an S=10 4x4 rear axle as the two wheel drive axle is usually too narrow unless you want wide wheels and wheel tubs.

Add in the challenge of getting everything lined up on a chassis it wasn't designed to go on.
Simply meaning that if you are looking at a frame swap as a cost saving over buying a front cross member (kit) an swapping rear axle an suspension you might not see any saving.

On the other hand the swap is viable if:
Your stock frame is junk for one reason or another,
The truck you started with wasn't a 1/2 ton short box to begin with. Bought a 1-1/2 ton for the cab and need a frame thing..
You didn't have any cab to start with. We have guys who buy the cab here, the nose there and the bed over there and combine.

Just something to ponder as for the reasoning for swapping frames to begin with.