Gear Ratio Calculator
Calculate your speed at any RPM for T5, T56, and custom transmissions. Enter your axle ratio and tire size to see real-world speeds in each gear, plus shift points for optimal acceleration.
Note: Always verify calculations independently before purchasing parts. Results are estimates and may vary based on actual tire dimensions, manufacturing tolerances, and wear.
Transmission
V8 World Class (85-89) (1985-1989)
3.73
Tire Size
/
R
Calculated Diameter: 25.68"
Performance at 3,000 RPM
48mph
3x1000
Engine RPM
Shift Point RPM
Speed in Each Gear at 3,000 RPM
| Gear | Ratio | Speed (mph) | Shift @ 5,500 |
|---|---|---|---|
| 1 | 3.35 | 18.3 mph | 33.6 mph |
| 2 | 1.93 | 31.8 mph | 58.4 mph |
| 3◀ | 1.29 | 47.6 mph | 87.3 mph |
| 4 | 1.00 | 61.4 mph | 112.7 mph |
| 5 | 0.68 | 90.4 mph | — |