POWERGLIDE AND TOROUE DRIVE TRANSMISSION 1972 SPEEDOMETER GEAR CHART DRIVE GEARS P M 6261794 Natural 6261785 Purple 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 ratzo tire size must be known POWERGLIDE TORO UE DRIVE 250 307 REAR GEAR GEAR SLEEVE AXLE REAR TIRE SIZE SPEEDO SPEEDO ADAPTER DRIVEN RATIO DRIVEN DRIVE ASSY GEAR 3 083 E78 14 F60 15 E70 14 3987920 6261794 3869914 3 083 F78 14 F70 14 G78 14 F78 15 G70 14 3987919 6261794 3869914 3 083 G70 15 G78 15 H78 15 8 55 15 3997918 6261794 3869914 3 364 E78 14 F78 14 F70 14 G78 14 F60 15 E70 14 G70 14 3987921 6261794 3869914 3 364 G70 15 G78 15 H78 15 F78 15 8 55 15 3987920 6261794 3869914 3 364 L78 15 3987919 6261794 3869914 POWERGLIDE 350 2 733 E78 14 3987922 6261785 3869914 2 733 F78 14 F70 14 G78 14 F78 15 G70 14 3987921 6261785 3869914 2 733 G70 15 G78 15 3987920 6261785 3869914 2 733 L 78 15 3987919 6261785 3869914 3 083 E78 14 F78 14 F70 14 F60 15 E70 14 3987920 6261785 3950352 3869914 3 083 H78 15 L78 15 3987922 6261785 3869914 VEGA REAR MODEL 4 337 4 343 AXLE USAGE GEAR SPEEDO GEAR SPEEDO RATIO DRIVEN DRIVE 2 53 P G w 1BC 3987918 6261794 2 92 Torque Drive 3987918 6261797 2 92 P G w 1BC 3987921 6261794 3 36 Torque Drive 3987921 6261797 3 36 P G w 2BC 3860347 6261795 GM PARTS DIVISION GENERAL MOTORS CORPOFlAT ON CHEVROLET 11 4 000 GROUP 4 56 c REV 4 81