Depending on the kit you get, it might have all, some, or none of the parts you need. You will need a transfer case drop kit and new U-bolts. Order a set from Quadratech or any other 4x4 parts place - they know the right size. Shouldn't need a pitman arm. Check the suspension at full droop without the shocks to see if any brake lines are stretched. Turn the front wheels side to side to check the brake lines. Might or might not have to fabricate brake line relocation brackets.
02 TJ Sahara 4.0 5 spd, 3.73, Dana 44 rear, 2.5" lift w/ Bilstein shocks, 33x12.50