A local jeeper with the same model told me he installed the Rubicon Express Spring Spacer lift on his, and loved it. He's also running 33" Wrangler Duratracs.
In my opinion, Old Man Emu offers the best "kit". Shocks, springs, transfer case spacers etc. $700 plus, a deal. Quadratec!!!!
Transfer Case
Mounted behind and driven by the vehicle transmission, the transfer case transmits power to the front and rear driveshafts in 4WD Jeep vehicles and offers high and low range.