If you are really going to thrash your truck in the future... The first thing for you to do is formulate a plan. What do you want your truck to do and how much cash are you planning to spend. A plan will save you time and money. You won't be doing the same work two or three times as you upgrade. If you are planning on going fast and don't want your truck to break every time you take it out, plan on tripling the amount you think you will need. Don't waste time with a 7.5. Go straight for an 8.8 or a 9" you won't have to replace later. Might think about getting a rear end with disc brakes as well. Gears and an install are not going to be cheap. Do it right the first time.
Oh, and if you are planning on going fast (with a 3.NO LOL), please put a cage in it. We don't want to read about you!
Oh, and if you are planning on going fast (with a 3.NO LOL), please put a cage in it. We don't want to read about you!