As for mods not to much, just instead of the small yj air box I installed a tj air box with k & n air filter which is way bigger than stock one. It has a 2006 tj aluminum radiator, bought it brand new from autozone. In January I installed new spark plugs, wires, cap and rotor. New fuel pump, water pump, and oil pump. I'm also including a bare Dana 30 front axle that already has the spring conversion done to it so youll get over a 6 inch lift with that installed. Like I said nothing in so you need to transfer parts from one under jeep into this one. And last thing I can think of is all new u joints front and rear. Also included is 1 extra set of rims with out tires.