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!
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount98 Dodge Cummins 24 Valve