All this has been done,check out Jrocks truck.Drop spindles? for king pin or did I miss something.Are you lowering it or slamming it.That would make the difference with your shaft issue,if just lowering it 4-5" 1 piece in my book if your slamming it you would want to stay 2 piece for cab clearence issues.280Z dual is a great choice for MC,and as for disc brakes just buy the brackets guys make them already,hell i will have a set for sale soon for the fronts.And are you body working this truck,i did not know they powder coated primer seems like a lot of work for something to be sanded down any way,just asking i like to learn the benefits of that.
Like were this is going though,please keep it up and dont stop,we are all here to help in any way. :thumbup: