with the 4" lift i did NOT need new camber bushings, the combo of the springs and drop brackets put everything back at near perfect..
now, on to adding lift. adding f-150 seats is possible with this kit, althought you WILL need adjustable camber bushings after doing this. then you run into more steering messes, does the truck have a drop pitman arm? most drop pitman arms arent enough of a drop as it is with a 4" lift, you might wanna look into an exaggerated drop arm, i think skyjacker sells them.
for the rear.. the simplest way to get 5.5 or so inches would be with a SOA swap. if the person who lifted the truck bought the RC leaf packs you could use an extended shackle to get another 1.5".
if the person got their shocks from RC they should be long enough for another inch or 2 of lift. when i put on the longer ext shocks RC sent me i had to compress them slightly to get them on the mounts.
What size tire is on the truck now? thats where you will get the most clearance, taller tires. honestly, 4" is a good amount of lift for any vehicle and you are able to fit 33s with a decent amount of fender gap still left.
if you have the lift leaf packs and wanna go to a SAS i have my stock leaf packs left and would trade you.. i didnt buy the leaf packs, just did an AAL and shackle.
wow, i was referenced in a post for knowledge, that is amazing!