If I went with that kit I would have to use spacers since the OEM wheels would not clear the new spindles. I would probably go with the spring packs instead of add a leaf because with all the extra weight I will wind up carrying new springs would probably be a good idea.That is an excellent kit. That is what is in Bryan's Red truck except he elected to go add-a-leaf instead of the spring packs. He is then cranked another inch and has one inch shackles out back. so basically he has 5 inches. on 33's. He could squeeze 35's with some cutting.