I actually have a 2 1/2 in lift and 1 inch shakles. It's a great setup. I almost have enough room for 35's. As for the Jet chip.
JET performance modules are custom calibrated for maximum torque and horsepower under a wide range of RPM’s and load ranges. Easily installed in just minutes! Stage 2 modules: calibrated for peak horsepower with Jeep 4.0L engines that are modified with low restriction exhaust systems (such as Borla headers and Cat-Back systems – sold separately) and a low temperature thermostat (Part # 10170). All stage 2 chips are street legal in all 50 states.
http://www.jetchip.com/