1968 Pontiac Firebird Speedometer Gear Usage

Information supplied by George Pearson
1968 Firebird Speedometer Gear usage Chart
  Driven Gear Or Sleeve Tire Size Speedometer Adapter    
Rear End Ratio Part # Teeth Color F70 X 14 195R X 14 E70 X 14   Model Ratio Part # Color Trans Code Drive Gear Teeth
3.08 3870351 17 PURPLE X X X           FF 7
3.23 3860341 18 BROWN X X X           FH-FF 7
3.36 3860341 18 BROWN X X             FH-FF 7
3.55 3860342 19 NATURAL X X             FH-FF 7
3.55 3987920 20 BLUE     X           FH 7
3.90 9780522 18 GREEN X X             FX 6
4.33 3860329 20 YELLOW X X             FX 6
Information supplied by George Pearson, taken from a Pontiac Parts Book