Semi-Truck Gear Ratio Calculator
Semi-Truck Gear Ratio Table
| Gear Position | Transmission Gear Ratio | Differential Gear Ratio | Overall Gear Ratio (OGR) |
|---|---|---|---|
| 1st Gear | 12.00:1 | 3.55:1 | 42.60:1 |
| 2nd Gear | 8.72:1 | 3.55:1 | 30.94:1 |
| 3rd Gear | 6.50:1 | 3.55:1 | 23.08:1 |
| 4th Gear | 4.75:1 | 3.55:1 | 16.86:1 |
| 5th Gear | 3.60:1 | 3.55:1 | 12.78:1 |
| 6th Gear | 2.80:1 | 3.55:1 | 9.94:1 |
| 7th Gear | 2.11:1 | 3.55:1 | 7.49:1 |
| 8th Gear | 1.65:1 | 3.55:1 | 5.86:1 |
| 9th Gear | 1.28:1 | 3.55:1 | 4.54:1 |
| 10th Gear | 1.00:1 | 3.55:1 | 3.55:1 |
| 11th Gear | 0.78:1 | 3.55:1 | 2.77:1 |
| 12th Gear | 0.64:1 | 3.55:1 | 2.27:1 |