TM  10-3930-669-20 4.  TRANSMISSION MALFUNCTIONS IN FORWARD AND REVERSE (CONT). KNOWN INFO Transmission   control   switches OK. Transmission operates normally in neutral. Transmission    oil    temperature gauge OK. Transmission speed switch OK. Transmission forward and reverse solenoids OK Tachometer OK. Inching valve OK. Transmission oil pressure OK. Transmission    oil    temperature OK. POSSIBLE PROBLEMS Universal joint(s) worn. High range solenoid faulty. KNOWN INFO Transmission control switches OK. Transmission operates normally in neutral. Transmission    oil    temperature gauge OK. Transmission speed switch OK. Transmission forward and reverse solenoids OK Tachometer OK. Inching valve OK. Transmission oil pressure OK. Transmission    oil    temperature OK. Universal joint(s) OK. POSSIBLE PROBLEMS High range solenoid faulty. TEST OPTIONS Audible inspection. REASON FOR QUESTION If   transmission   is   excessively noisy   in   forward   and   reverse, universal joint(s) may be worn. TEST OPTIONS Visual inspection. REASON FOR QUESTION If transmission will not change from low to high speed or high to low speed, high range solenoid may be faulty. 2-326