I was going to suggest doing yourself also, it's a fairly easy job with no special tools needed. Jim Carters is now selling new worm shafts and ball sockets that weren't available not to long ago if you was to need one. If you shop e-bay, you can still find NOS parts for them, or go to any of the major parts venders for bearings, bushings, and seals. Follow this manual,
https://www.flickr.com/photos/advance-design_parts_co/sets/72157632210242370/ , even though it for a '52, it still applies to your gear box. I rebuilt my '41 gear box which is like yours, with NOS parts I scrounged up, it works as good new and drives as easy as if it had power steering.
Joe
