41-71 CJ's use a Ross steering box that is integral with the steering column-totally different from 72 and newer Jeeps.
There are rebuild parts available, but AFAIK no one sells rebuilt units.
The Ross box is a pretty primitive design dating back to the early 1940's. If you plan to keep the Jeep stock, it will be OK as long as all components are in good shape. If you plan a lift & big tires, you should consider a Saginaw steering swap-this is a common mod on early CJ's. Check out the pics here-