| 1970 Tempest & GTO Speedometer Gear usage Chart | |||||||||||||
| Driven Gear Or Sleeve | Tire Size | Speedometer Adapter | |||||||||||
| Rear End Ratio | Part # | Teeth | Color | F78 X 14 | G70 X 14 | G78 X 14 | H78 X 14 | Model | Ratio | Part # | Color | Trans Code | Drive Gear Teeth |
| 3.08 | 3870351 | 17 | PURPLE | X | DJ | 7 | |||||||
| 3.08 | 3870351 | 17 | PURPLE | X | 9775739 | BLACK & WHITE | DJ | 7 | |||||
| 3.08 | 3860342 | 19 | NATURAL | X | DJ | 7 | |||||||
| 3.23 | 3860341 | 18 | BROWN | X | DJ | 7 | |||||||
| 3.23 | 3780351 | 17 | PURPLE | X | X | X | DJ | 7 | |||||
| 3.31 | 3860341 | 18 | BROWN | X | X | DP | 7 | ||||||
| 3.55 | 3860342 | 19 | NATURAL | X | X | DJ-DP | 7 | ||||||
| 3.55 | 3860341 | 18 | BROWN | X | DJ | 7 | |||||||
| 3.90 | 9780522 | 18 | GREEN | X | X | DL | 6 | ||||||
| 3.90 | 9780523 | 17 | BLACK | X | DL | 6 | |||||||
| 4.33 | 3860329 | 20 | YELLOW | X | X | DL | 6 | ||||||
| 4.33 | 9781826 | 9 | ORANGE | X | DL | 6 | |||||||
| Information supplied by George Pearson, taken from a Pontiac Parts Book | |||||||||||||