TM 10-3930-659-10 3-7.CHECK AND FILL TRANSMISSION OIL (Con’t). (5)  Turn  and  remove  transmission  oil  level  gage  (1),  wipe  clean  with  rag  (Item  7,  Appendix  D),  and  install  into transmission oil level gage fill tube (2). (6)  Check  transmission  oil  level  with  engine  at  a  slow  Idle.    Oil  must  be  between  COLD  and  HOT  marks  on transmission oil level gage. TA704524 3-13