Replacement Gear Fits 1968 Automatic Transmission With 2.73 Ratio Rear Gear Fits 1969 (350ci) Automatic Transmission With 2.73 Ratio Rear Gear Fits 1969 (SHP 427ci) Automatic Transmission With 3.07, 4.10 Ratio Rear Gear Fits 1970 350ci Automatic Transmission With 2.73 Ratio Rear Gear SPECIAL NOTE: All speedometer gears are based on original tire size and differential gear ratios.