4 SPEED TRANSMISSION 1971 SPEEDOMETER GEAR CHART DRIVE GEAR NUMBER F DRIVEN GEARS 3987919 Natural 19 3987920 Blue 20 3987921 Red 21 NOTE To order speedometer gears and parts transmission rear axle ratio and tire size must be known NOVA 4 337 4 343 REAR GEAR GEAR AXLE REAR TIRE SIZE SPEEDO SPEEDO RATIO DRIVEN DRIVE 3 308 E78 14 E70 14 3987921 6261794 CHEVELLE CAMARO 4 337 4 329 REAR GEAR GEAR AXLE REAR TIRE SIZE SPEEDO SPEEDO ADAPTER RATIO DRIVEN DRIVE ASSY 3 083 E78 14 3987920 6261794 3 083 F70 14 F78 14 3987919 6261794 3 308 E78 14 F78 14 F60 15 3987921 6261794 3 308 G78 14 G70 15 G78 15 3987920 6261794 3 364 E78 14 F78 14 G78 14 3987921 6261794 3 417 F70 14 3987921 6261794 3 727 F60 15 3987919 6261794 3950352 4 100 F78 14 F60 15 3987921 6261794 3950352 1972 SPEEDOMETER GEAR CHART DRIVE GEARS 6261794 Natural 8 3978758 Steel 8 DRIVEN GEARS 3987918 Brown 18 3987919 Natural 19 3987920 Blue 20 3987921 Red 21 3987922 Solid Silver 22 NOTE To order speedometer gears parts transmission type rear ax e ratio tire size must be known I GIvI PARTS DIVISION GENERAL MOTORS CORPORATlON CHEVROLET 11 4 000 GROUP 4 18 c REV 4 81