My bronco already has power steering but my steering box just bit the dust, I was thinking about upgrading pumps also. Would I need anything else for this to fit? And would it be ok to run 35s?

This kit comes with a new lower joint to connect your shaft to the new steering box. If you do not already have a custom lower steering shaft for this joint, you may consider part # 1961. It comes with the custom lower steering shaft as well. 35's should be no problem with this setup.