TM 10-3930-669-20 2.  DRIVE AXLE NOISE GREATER UNDER POWER THAN DURING COAST (CONT). KNOWN INFO TEST OPTIONS Drive axle oil OK. Drive axle oil level check. POSSIBLE PROBLEMS REASON FOR QUESTION Drive axle oil level low. If drive axle oil level is low, gear friction   will   increase   and   make more noise under power. KNOWN INFO TEST OPTIONS Drive axle oil OK. Drive axle oil level OK. Verify repair. POSSIBLE PROBLEMS REASON FOR QUESTION If    drive    axle    noise    is    normal under    power,    fault    has    been corrected. ¬ ¬ 2-382