Replacing the A/T in my ‘72 Charger with a manual. The FSM got me through disassembly but now I need to get rid of the arm on the end of the shift tube. Do I have to replace the tube or can the lever be removed?

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‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500