Description
A 3.89 gear ratio delivers the performance sweet spot for street and strip applications—sharper acceleration off the line without sacrificing highway cruising. Whether you’re building a dedicated track car or optimizing an existing 9-inch Ford rear end, this ratio maximizes power delivery across the RPM band where it matters most. JJ-Motorsports’ complete kit eliminates the guesswork with all necessary components for a professional-grade installation.
- 3.89 gear ratio
- 28-spline pinion
- Ford 9-inch compatible
- Complete kit included
- Bolt-on installation
- Factory-matched tolerances
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