f11. TRANSMISSION UNUSUALLY NOISY WHEN OPERATING                                                YES Go to step 6 of this fault NO Some transmission faults will only be audible when vehicle is in motion.     REASON FOR QUESTION     Noise Check            TEST OPTIONS            Transmission oil level OK.         Oil not contaminated. Operation temperature normal. No codes logged in ECU.             KNOWN INFO                     POSSIBLE PROBLEMS        Faulty PTO engagement. Faulty scavenge pump engagement. Faulty oil pump. Faulty flexplate. Faulty propeller shafts and / or universal joints. Faulty transmission transfer case. TM 9-2320-365-20-2 2-1420          Change 1 INITIAL SETUP   Equipment Conditions     Engine shut down (TM 9-2320-365-10).   Tools and Special Tools     Tool Kit, Genl Mech (Item 44, Appendix C)     Goggles, Industrial  (Item 15, Appendix C)     Wrench, Torque, 0-200 lb-in. (Item 58, Appendix C)     Wrench Set, Socket (Item 49, Appendix C)     Wrench, Torque, 0-175 lb ft (Item 57, Appendix C) Is transmission noise present when vehicle is in neutral? START 1. Tools and Special Tools   STE/ICE-R (Item 39, Appendix C) Materials/Parts   Packing, Preformed (Item 199, Appendix G)   Adapter, Straight, Pipe to Tube (Item 1.2, Appendix D)   Adapter, Straight, Tube to Boss (Item 1.3, Appendix D)   Hose Assembly, Nonmetallic (Item 25.1, Appendix D) References   TM 9-4910-571-12&P