SERIES 10 thru 40 SPEEDOMETER GEAR NUMBER CHART TIRE SIZE See Note Series Trans Pinion 6 50 16 6 70 15 7 00 17 7 00 18 7 00 20 7 50 17 7 50 20 7 17 5 7 22 5 8 17 5 8 19 5 8 22 5 R Gear 10 3 SPD 13 44 3726645 3726645 exc H D 10 PG 13 44 3726645 3726645 7 10 3 SPD H D 13 44 3752390 10 3 SPD H D 10 39 3707598 3707598 3752392 10 4 SPD l0 39 3707598 3752392 V exc 4 WD 10 4 SPD 13 44 3752390 exc 4 WD 10 4 WD 10 39 3760517 3760517 20 3 SPD H D 7 32 3760342 3760341 20 3 SPD H D 7 36 3760342 D D VAN 20 4 SPD 7 32 3760342 3760342 3760341 3760342 exc 4 WD 20 4 SPD 7 36 3760340 D D VAN 20 4 WD 7 32 3760358 3760357 3760357 3760358 3760357 3760356 30 3 SPD H D 7 36 3760342 3760342 3760343 3760343 3760342 30 4 SPD 7 36 3760342 3760342 3760342 3760343 3760343 3760342 40 4 SPD 6 36 3760346 3760345 3760345 3760345 3760346 3760344 SERIES 50 thru 80 See Note Series Trans RPirg0nr 7 00 20 7 50 20 8 22 5 8 25 20 9 00 20 9 22 5 10 00 10 00 20 10 22 5 11 22 5 BB 50 4 SPD 5 33 3760346 3760345 3760345 3760344 3760344 60 4 SPD 5 36 3760347 3760347 3760346 3760347 3760347 3760346 60 SBC 4 SPD 5 33 3760346 3760345 3760345 3760344 3760344 60 5 SPD 5 32 3760349 3760348 3760348 3760348 60 5 SPD 6 39 3760350 3760349 3760348 3760349 3760348 3760348 60 5 SPD 6 43 3760350 3760349 3760350 3760349 70 SBC 4 SPD 5 36 3760346 3760347 3760347 3760346 3760347 3760347 70 SBC 5 SPD 5 32 3760349 3760348 3760348 3760348 70 SBC 5 SPD 6 39 3760350 3760349 3760348 3760348 3760348 3760348 70 SBC 5 SPD 6 43 3760350 3760350 3760350 3760349 70 TDIVI Aug S I r3nS 6 43 3770381 3770381 3770382 70 80 5 SPD 5 32 3760354 3760353 3760352 3760352 70 80 5 SPD 6 39 3760354 3760354 3760353 3760352 3760352 3760352 3760352 3760352 70 80 5 SPD 6 43 3760355 3760355 3760353 3760354 3760353 V NOTE Axle Ratio Ring Gecxr Pinion 43 6 7 17 GEAR ASSEMBLY w filling Ser 20 w 3 SPD P G exc H D 6 70 15 7 50 17 7 00 17 7 00 18 7 17 5 8 17 5 8 19 5 blue cmd purple 13 teeth 3756906 4 338 1 Ser 20 w 3 SPD P G exc H D 8 19 5 blue und white ll teeth 3756902 4 338 1 Ser 20 w 3 SPD P G exc H D 7 00 17 7 50 17 8 17 5 blue ond yellow 12 teeth 3756904 4 338 1 Ser 20 w 3 SPD P G exc H D 7 17 5 8 17 5 14 teeth 3756908 4 338 1 Chevrolet Motor TRUCK Mama CATALOG General Motors Corporation