SPEEDOMETER GEAR CHARTS 1979 smzzno GEAR usAcE CHART B CAR 49 I 5 RIVE DRIVEN Y GEAR GEAR ADAPTER 8628838 Purpls 3987919 19 Natural 345215 3905497 0 8800 T 6251785 Purple 3987918 18 Brown 345215 3987920 20 Blue 345215 3887921 21 Red 345215 e 5 4 44 A me snzs 4 W 5 R 5 A A nn GR7a 16 GR70 15 241 A 1 B IIII cms 1s GR70 1s HR70 15 B II HR78 16 KKEHKIIIIIE Fm 1s j me IIIHQ GR78 15 GR70 15 III IIIIIK s Rva 15 cms 15 GR7D 15 IIE 473 WB B 3 FR78 15 c vs 1s cmu 15 HR78 15 HR70 15 IEIII I NOTE Eng 305 LGR 750IL W1 Eng 250 L22 GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET 1O 4 000 GROUP 4 10 c REV 9 78