Basically the only things that will go bad is rubber hoses and gaskets. If the engine has been sitting this whole time without being started you may want to put some oil inside the cylinders and let it sit for a while before trying to turn the engine over. When you do turn it over, do so by hand, not with the starter. Go a couple full rotations to make sure nothing is stuck (open valves, piston rings etc) before trying to start it with the starter.
You'll probably have to take the carb apart and clean it up as well, all the fuel will have gummed up and plugged the little passages up.
Check to make sure the spark plug wires and fuel lines are still solid. Finally, before you start the engine with the starter, take the distributor out and turn the oil pump to build oil pressure and make sure everything is coated. Then give her a go! Chances are every single seal on the engine is going to leak after drying out for the last 10 years or so, but the engine is probably fine otherwise.
Shouldn't have to do anything with the transmission / tcase or the rest of the driveline. Brakes would just be a matter of checking rubber hoses. May have to get the rotors turned to clean the surface rust off them. Fuel lines may also be a concern if they have dry rotted out, or filled with varnish. Make sure you give the truck a full tank of fresh fuel too, the crap in the tank now may plug up your fuel filters and stuff for a while.
