The wiring harness you just have to take apart and rewire, the vss sensor wiring was like $10 shipped, the trans-transfer case adapter was $30 at a junk yard, and the drive shaft mod I paid $80. The crossmember I did myself, but I weld, and I have the older easy to do one, and the tune is just a segment swap, so it might not be as much as a full tune, I have hptuners, so it was free to me. A stock 80e will take anything you can throw at it if you truck is stock otherwise. Anything that is more than 4500lbs and is capable of towing should have come with it stock in the first place.