POWERGLIDE AND TOROUE DRIVE TRANSMISSION 1972 SPEEDOMETER GEAR CHART A DRIVE GEARS PART NUMBER COLOR NUMBER OF TEETH 6261794 Natural 6261785 Purple DRIVEN GEARS 3987918 Brown 18 3987919 Natural 19 I 3987920 Blue 20 3967921 Red 21 3987922 Solid Silver 22 NOTE To crdsr spsedom tsrgesrs parts transmission type rear axis ratio Ura sila must bs known POWERGLIDE TORQUE DRIVE I 250 307 REAR GEAR GEAR SLEEVE AXLE REAR TIRE SIZE 4 SPEEDO SPEEDO ADAPTER DRIVEN RATIO DRIVEN DRIVE ASSV GEAR 3 063 E78 14 F60 15 E70 14 3987920 6261794 3869914 3 063 F78 14 F70 14 G78 14 F78 15 1370 14 3987919 6281794 3869914 8 063 G70 15 G78 15 H78 15 8 55 15 3997918 6261794 3869914 3 364 E78 14 F78 14 F70 14 678 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 6281794 3869914 POWERGLIDE 1350 2 733 E78 14 3987922 6261785 V 3869914 2 733 F78 14 F70 14 G78 14 F7B 15 G70 14 3987921 6261785 3869914 2 733 G70 15 G78 15 3987920 6261785 3869914 2 739 L 78 15 3987919 6261785 3869914 3 063 E78 14 F78 14 F70 14 F60 15 E70 14 3987920 8261785 3950352 3869914 3 083 H78 15 L78 1v5 3987922 6261785 3669914 VEGA REAR MODEL 4 337 4 343 AXLE USAGE GEAR SPEEDD 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 K GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET 11 REV 4 77 4 215 4 337 4 337