| 1964 Pontiac Speedometer Gear usage Chart | |||||||||||
| Driven Gear Or Sleeve | Tire Size | Speedometer Adapter | |||||||||
| Rear End Ratio | Part # | Ratio | Color | 8.00 x 14 | 8.50 x 14 | 7.60 x 14 | 7.10 x 14 | Model | Ratio | Part # | Color |
| 3.23 | 3860342 | 19:8 | Natural | X | X | ||||||
| 3.42 | 3987920 | 20:8 | Blue | X | X | ||||||
| 3.64 | 3860344 | 21:8 | Red | X | X | ||||||
| 3.9 | 971902 | 17:6 | Black | X | X | ||||||
| 4.10 | 9771729 | 18:6 | Green | X | X | ||||||
| Information supplied by George Pearson, taken from a Pontiac Parts Book | |||||||||||