TM 9-2520-246-34-1 2-23. SHIFT TEST. The following paragraphs give instructions for testing the transmission transfer after final assembly and includes removing the transmission transfer assembly from stand. NOTE Before making tests, fill transmission as- sembly with 1/2-pint of gear oil. Refer to LO 9-2320-209-12/1. Attach a tag to filler plug saying transmission transfer must be filled after it is put back in truck. 2-283