| 1968 Firebird Speedometer Gear Usage Chart (Turbo 400) | |||||||||||||
| Speedo Driven Gear | Tire Size | Speedometer Adapter | |||||||||||
| Rear axle ratio | Part No. | Teeth | Color | F70 X 14 | 195R X 14 | E70 X 14 | Model | Ratio | Part No. | Color | Sleeve & seal assy. | Trans code | Drive gear teeth |
| 2.56 | 1359270 | 36 | WHITE | X | X | 1362294 | PY | 18 | |||||
| 3.08 | 1359272 | 38 | BLUE | X | 1362294 | PQ/PX | 16 | ||||||
| 3.08 | 1359272 | 38 | BLUE | X | 1362293 | PQ/PX | 16 | ||||||
| 3.23 | 1362048 | 40 | BLACK | X | X | 1362293 | PQ/PX | 16 | |||||
| 3.55 | 9780470 | 44 | DK BLUE | X | X | 1362293 | PQ/PX | 16 | |||||
| 3.90 | 1362049 | 42 | GREEN | X | X | 666-AJ | .8653 | 9775436 | BLUE | 1362293 | PQ/PX | 16 | |
| Information supplied by George Pearson, taken from a Pontiac Parts Book | |||||||||||||