I SPEEDOMETER GEAR CHARTS I 1978 SPEEDO GEAR USAGE CHART DRIVE DRIVEN GEAR GEAR ADAPTER A 6261785 10 Purple 3987919 19 Natuml 345215 H 3950352 8242 C B 3987922 22 Silver 345215 C 6261796 9 Red 3957920 20 Blue 346215 D 6261784 S Orange 3987921 Z1 Red 345215 E 361002 7 Green I I 1978 SPEEDO GEAR USAGE CHART I F CAR e 4 I 0 41 A me snzs I M 5 I E78 I4 FR78 I4 2 41 A E78 14 FR7S 14 273 E A II Eva 14 Fma 14 KE1 A II E78 14 FR7E 14 308 M20 C IIE r E78 14 FR78 I4 Mss A KN II emo vs E iK E EIK GR70 15 3 73 mj IEE I I I I I I I I GM PARTS DIVISION GENERAL MOTORS CORPORAT ON CHEVROLET 1O REV 9 78 4 s c 4 000 GROUP