You don't need a "key" to get a 2" lift. You get a leveling kit...no key involved, easier on your driveline angles.
You can probably put 33" tires on it without doing anything, but you won't get much clearance.
A 2" leveling kit on a 3/4 ton will most likely get you 35" tires. You may need to trim some plastic to prevent tire rub though, not really a big deal if you take your time and make it look nice.
