With a 3" lift on an 04, you're pretty much looking at just new keys. I don't think theres much of a difference between the kits, I'd look on Ebay theres some pretty cheap kits on there...
Here is my 06 with a RC 3in leveling kit. Came with new keys, shocks, and taller rear blocks. Bought it RC online for 200 bucks last year. Very happy with the results...
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