I would like to get a newer truck, say 3rd gen but that won't be for a year at least. And I plan on do 35's at MOST. Not sure of the gear ratio, but the guy had it set up to haul. The wheels right now are American racing wheels, not aure what size but I wanna say 12.50. My truck does have a little pull to the right, and I feel like my teuck Ian't running as good as when I got it. I plan on getting it checked out (don't think anything's really wrong, but it sounds whiney, not a real truck sound) the previous owner didn't say anything about an axle swap but theres an air ride deal in the back and when I don't keep some air in there it feels like my truck is slamming down when I drive over pretty normal road teansitiobs, so I keep air in it all the time.
I wouldnt bother lifting or doing tires if you dont plan on keeping it. Svave the money for the new truck... Prioritize your money dont just lift this truck for the sake of lifting if you're not gonna keep it dont spend the money. For gear ratio open your glove box up and the tag in there will tell you. Theres a physical way to tell as well, just go on youtube and search around. Aftermarket is a good sign, for a 12.5" wide tire I would do smaller then an 8.5" wide wheel, preferably 9". You should not go over 3" in the tire width to rim width ratio. Did that get across right? For the pull, check your ball joints, wheel hub bearings and the track bar. Wheres the whine coming from? 5 bolt axles are stock half ton axles: Dana 44 and Chrysler 9.25. 8 bolt would most likely be Dodge Dana 60 axles. I dont know a whole lot about air ride suspension but that sounds right if theres no air in them... Hopefully someone else will chime in.
And p.s. I really want to have a nice, cool truck but I want it to run good and I got 150k miles so I don't want to do anything to it if it's not running prime, because with 150k miles I mine as well get rid did it and get something with lower miles, because if I keep it and do stuff too it who wants to buy a badass truck with say 200k+ miles?
To me, sounds like you should just not bother lifting this one and just save for your next truck. I had a dakota before this truck that I really wanted to lift, but I didnt because I had no plans to keep the truck. Would have been just a pure waste of money.
Open to any suggestions, I thought about getting a car not too long ago but having a truck is just better, gas is more but it's worth it. It isn't fun getting a nice car dirty lol but a truck, I love gettin dirty and cleaning it! And I can load up a bike and quad and go mob and have fun, so truck is definetly what I will kelp. The only question is what truck, like I said I'll have this for at least a year unless I decide I want to just try and get a newer year, say a 3rd gen. I want a 4 door, and preferably white (I dig the white a lot) but that's not the winning factor.
I hear you, trucks are just so much.... Ill use the word "better" then cars. I think you need to sit down and do some thinking. You need to figure out what you want to do. Sounds to me like you really want something newer. If you do, theres really no point in doing anything to this one. I know I keep saying that but I just want the point to get across. The only other thing to remember is if you go 3rd gen you can get a hemi with 350hp stock and 375 ft/ibs stock. They are independant front suspension as well, much smoother ride then the straight axle, but garbage for any offroad use. Sit down and think man, you dont have to come up with a decision immediately! Take some time figure out what you want to do in the future thats feasible. After that we can proceed 
