Differential Regearing:
Restore Your Power
Bigger tires killed your acceleration and fuel economy. Regearing is the only way to get it back.
Why Your Truck Feels Sluggish
When you install larger tires, your effective gear ratio drops dramatically. Here's what happens:
Stock Setup
- ✓Factory-tuned gear ratio matches tire size
- ✓Engine stays in optimal power band
- ✓Smooth shifts, good fuel economy
After Big Tires
- ✗Effective ratio too tall for tire diameter
- ✗Transmission hunting for gears constantly
- ✗Sluggish acceleration, poor MPG
Find Your Perfect Ratio
Select your vehicle and tire size to calculate the optimal gear ratio using real engineering formulas.
Select your vehicle and tire size to calculate the perfect ratio.
Why Trust Us With Your Axles?
Regearing requires precision and experience. Here's how we ensure your build is done right.
Master Install Kits
We only use complete master kits with Timken/Koyo bearings, new seals, and shims. No cutting corners.
Precision Setup
Every gear set is properly set up with dial indicators to ensure correct backlash and contact pattern.
Proper Break-In
We provide detailed break-in instructions. 500 miles of easy driving ensures your gears last 200,000+ miles.
Gear Ratio Comparison Chart
See the effective percentage change between any two gear ratios. Use this to understand the impact of your regear decision.
| From ↓ / To → | 3.08 | 3.42 | 3.55 | 3.73 | 3.91 | 4.10 | 4.30 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3.08 | — | +11% | +15% | +21% | +27% | +33% | +40% | +48% | +58% | +67% | +72% | +75% |
| 3.42 | -10% | — | +4% | +9% | +14% | +20% | +26% | +33% | +43% | +50% | +55% | +57% |
| 3.55 | -13% | -4% | — | +5% | +10% | +15% | +21% | +28% | +37% | +45% | +49% | +52% |
| 3.73 | -17% | -8% | -5% | — | +5% | +10% | +15% | +22% | +31% | +38% | +42% | +44% |
| 3.91 | -21% | -13% | -9% | -5% | — | +5% | +10% | +17% | +25% | +31% | +35% | +38% |
| 4.10 | -25% | -17% | -13% | -9% | -5% | — | +5% | +11% | +19% | +25% | +29% | +31% |
| 4.30 | -28% | -20% | -17% | -13% | -9% | -5% | — | +6% | +13% | +19% | +23% | +25% |
| 4.56 | -32% | -25% | -22% | -18% | -14% | -10% | -6% | — | +7% | +13% | +16% | +18% |
| 4.88 | -37% | -30% | -27% | -24% | -20% | -16% | -12% | -7% | — | +5% | +8% | +10% |
| 5.13 | -40% | -33% | -31% | -27% | -24% | -20% | -16% | -11% | -5% | — | +3% | +5% |
| 5.29 | -42% | -35% | -33% | -29% | -26% | -22% | -19% | -14% | -8% | -3% | — | +2% |
| 5.38 | -43% | -36% | -34% | -31% | -27% | -24% | -20% | -15% | -9% | -5% | -2% | — |
Positive percentages indicate higher RPM (numerically higher gears). A 5% change is barely noticeable, 10-15% is felt during acceleration, and 20%+ dramatically changes the driving experience.
Frequently Asked Questions
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Ready to Restore Your Power?
Stop fighting your transmission. Get back the acceleration and fuel economy you lost to big tires.