Disc Brake swap-A body Rotors

I am not sure about the availability of the 4" BP rotors that will work for that setup but a few phone calls should give you the answer. I think several people have found themselves with the big/small situation. Switching the rear axles is not that expensive and pretty easy to do. Moser has a set of new relatively inexpensive axles that might be a good option. If you are interested, I may have a set of axles that were filled and redrilled for 4.5"