You don't have to do anything to the steering except get an alignment when you're done. Things get more involved when you have a higher lift. You may not even "need" to do the brake lines.
Don't forget proper bump stops, adjustable track bar to re-center the axle, adjustable control arms to maintain proper caster, and driveline angles. A SYE and double cardan driveshaft in the rear may be needed. The front you don't need to think about as much because it already has a double cardan driveshaft and using adjustable lower control arms takes care of the caster and driveshaft angle at the same time.
A TC drop is a poor solution. It puts more tension on your engine mounts, it lower your exhaust hanger, lowers ground clearance, messes with your transfer case linkage, and maybe something else I've forgotten. You should see my contorted exhaust system from the PO because of how parts were installed before/after the TC drop. One day I'm going to cut it off and straighten it out.
