i installed a 2 inch body lift on my super cab (cleared 31s), a 3 inch is just a few bucks more than a 2 inch, if you dont want quite 3 inches you could cut an inch off that way if you decide you dont like the 3 you could have 2 or even a 1 inch body lift.
i never disconnected anything when doing my lift, i just payed attention. but nothing ever got tight. didnt even need the steering shaft extension.
ive read about people on here installing a 3 inch body lift without using the steering extension or putting slack in any thing.
for me the worst part was the front, it was super rusted and i had to use a pipe wrench to get a hold of the nut. in a super cab there isnt much room in the back to use a cheater bar. i had to use a cheater bar on every nut/bolt. it took about 8 hours to do the cab alone. i would grease the crap out of the bolts when you put them back in.
if i was to redo a body lift i wouldnt buy the kit. the washers that came with my kit just got all bent up before i even got to half the torque specs, you can buy all the hardware, and you can get the lift blocks for cheap. i took pictures of the block and bolts dimensions for my 2 inch lift, and there on this site somewhere if you want to go that route.