Differential Gear Ratio Calculator
Calculate current ratio, find optimal gearing, or compare ratio changes for performance tuning.
Common Differential Ratios
| Ratio | Ring/Pinion | Application |
|---|---|---|
| 2.73:1 | 41/15 | Highway/Economy |
| 3.08:1 | 40/13 | Light Duty |
| 3.23:1 | 42/13 | Balanced |
| 3.55:1 | 39/11 | Performance |
| 3.73:1 | 41/11 | Popular Performance |
| 4.10:1 | 41/10 | Acceleration |
| 4.56:1 | 41/9 | Towing/Off-road |
Understanding Differential Ratios
Higher Ratio (Numerically)
- Better acceleration and towing capability
- Higher RPM at highway speeds
- More torque multiplication at wheels
- Lower top speed in each gear
- Reduced fuel economy
Lower Ratio (Numerically)
- Better fuel economy at highway speeds
- Lower cruising RPM (quieter, cooler)
- Higher top speed potential
- Less responsive acceleration
- May require downshifting for hills
Gear Ratio = Ring Gear Teeth / Pinion Teeth. A 4.10 ratio means the driveshaft turns 4.10 times for each tire revolution.