Replace the tube, change the transmission fluid using the correct fluid for your Jeep and change all filters since fluid got overheated due to low oil level.
Test drive and see how it does. You may have gotten lucky!
If transmission acts or shifts funny, find yourself a good reparative transmission shop and let them thoroughly diagnose the transmission and rebuild yours if problems require.
Total replacement is only required if for some reason if yours is not rebuildable...
Good luck and let us know how you come out!
