Using 3/4 ton springs on a 1/2 ton

Ok, I have a 94 king cab silverado 1/2 ton 2wd that I want to swap in a rear diff and springs out of a 94 3/4 ton. I just got a 22' pro-line center console and need to increase the towing ability of my truck since there is nothing wrong with it.

Questions:
a) Can these be directly exchanged or is there a difference in hangars?
b) any drive shaft differences?
c) does it matter if the rearend and springs come out of a 4wd or does it have to be 2wd?
d) what is an easier way to get my truck to more comfortably tow the boat?

Any suggestions would be greatly appreciated. I want to keep this truck at least another year before I get a new one.

/wwwthreads_images/icons/cool.gif 84 cj7 Laredo /wwwthreads_images/icons/cool.gif Superior 1 piece, more to come...../wwwthreads_images/icons/smile.gif