The Tcase drop and pitman arm come with the Kit. You don't need to order anything else to make it work.. I got the 4" lift. on my YJ.. I ordered a new steering stabilizer and some shock guards also.. just cuz i wanted them.
you honestly don't need the drop pitman arm. but i did the same as yjJEEPyj by ordering the extra stuff. oh and you will forsure need new leaf spring bolts cause you will need to cut them off, ask anyone lol.
I purchased my RC lift through eBay but instead of doing the "buy it now" I called the number and they gave it to me for $450 with free shipping. They will answer any questions you have and you can order extra parts through them.