TM 9-2520-246-34-1 2-12. SHIFT TEST. The following paragraphs give instructions to test the transmission for smooth and positive shifting in all ranges after final assembly. NOTE Before making tests, fill transmission assembly with 1/2 pint of gear oil. Refer to LO 9-2320-209-12/1. Attach a be filled a. Neutral Position. tag to filler plug saying transmission must after it is put back in truck. FRAME 1 1. Put gear shift lever (1) on shifter shaft (2). 2. Put in capscrew (3), washer (4), and nut (5). GO TO FRAME 2 2-108