I'm guessing that this truck will be a pavement pounder, because if you wheel it, those CV axles wont hold up, 33's are the biggest id go if you are going to take it off road, about gears, with 4.10's and 38's you will probably have to start out in low range, unless you want to burn up your clutch, 5.29's will work but don't go any lower, because they make 5.71's but they are weak because the pinion is so small, and you should do some kind of brake upgrade, because those tires weigh a lot more than your stock ones. about the rear, I'm not too sure, you best bet would have a spring shop re-arch your springs, and go with a add-a-leaf, shackles, and (hate to say it) blocks, hope this helps, thats all i can think of right now, i may think of something later so i may post again
