| 1964 Tempest & GTO Speedometer Gear usage Chart | ||||||||||
| Driven Gear Or Sleeve | Tire Size | Speedometer Adapter | ||||||||
| Rear End Ratio | Part # | Ratio | Color | 6.50 x 14 | 7.00 x 14 | 7.50 x 14 | Model | Ratio | Part # | Color |
| 4.30 | 543800 | 19:6 | Orange | x | ||||||
| 3.73 | 9771729 | 18:6 | Green | x | ||||||
| 3.73 | 9771902 | 17:6 | Black | x | x | |||||
| 3.55 | 3860344 | 21:8 | Red | x | x | |||||
| 3.90 | 9771729 | 18:6 | Green | x | x | |||||
| 3.90 | 9771902 | 17:6 | Black | x | ||||||
| 3.23 | 3987920 | 20:8 | Blue | x | x | |||||
| 3.23 | 3860342 | 19:8 | Natural | x | ||||||
| 3.08 | 3860342 | 19:8 | Natural | x | x | |||||
| 3.08 | 3860341 | 18:8 | Brown | x | ||||||
| 3.36 | 3860344 | 21:8 | Red | x | x | |||||
| 3.36 | 3987920 | 20:8 | Blue | x | ||||||
| Information supplied by George Pearson, taken from a Pontiac Parts Book | ||||||||||