Welcome, John, I'm sure you will get many suggestions but what would help is to state how the truck is going to be used. If it's going to haul loads or pull a loaded trailer then what is suggested will be completely different that one that will be used just for cruising. Shallow gears or overdrive transmissions are the cats meow for cruisers but worthless for one that's going to work regularly. There are also some "middle of the road" combinations that can be used for dual purposes. A little more info would help.

Evan