OK! Here is what I have learned. I called several places that do regear of the Rubicon axle and told them what I have and what I am trying to accomplish. They all tell me it is not necessary to change the carrier.
Yes. I told them the axle have 3.73 now and I wans to go the 4.56 . They assured me no carrier change is necessary. To quote, "There is no need to get rid of a perfectly good locker. All that you need are the gears, bearings and seals".
Now, I will try to get a good deal on that front 44 that is up for sale.