GIR 1 TERMS OF HEADING 84.83 INCLUDES GEARS AND GEARING , BALL OR ROLLER SCREWS,GEAR BOXES AND OTHER SPEED CHANGERS, INCLUDING TORQUE CONVERTERS. FLY WHEELS. GIR 6 TERMS OF ONE DASH SUBHEADING 8483.10 OTHER CRANKS AND CRANK-SHAFTS. TERMS OF TWO-DASH SUBHEADING 84831057 OF CAST IRON OR CAST STEEL