If your just goin 3", all you really need is the longer coil(or spacer)for the front, and an add a leaf, block, or spring pack for the rear. You can get away without replacing the shocks, but i'd replace em anyway...
Anything more then 3 inches, you'll have to start replacing steering stuff, and your control arms.
Oh and even if you just do the basic 3 inch lift....get rid of that POS track bar...
If you plan on going with larger tires, keep an eye on your hubs....they like to gernade with out warning..
i love my Dodge, but......