No I know they don't need a lic. Lmao I have a 48 I'm looking to get narrowed down ! I'm in central Illinois area.
I am pretty sure the fellows at Frankland can do it. Click on this and go down to post #4. http://www.jalopyjournal.com/forum/showthread.php?t=47638 They put 9 in axles and a quick change rear into my friends banjo rear end.
They are pretty simple, anyone that does quickchanges should be able to figure one out pretty easy Also if you are getting one narrowed you might consider switching the ends out from fords iffy tapered key setup
What's wrong with hot rod works? They did a great job on mine, open drive and late model axles. They did all the machine work, quality work and really nice guys to work with.