SKU: ALL 70012
UPC: 848238037876
MPN: ALL70012
The Ring & Pinion Ford 9in 3.70 by Allstar Performance is a precision differential gear set engineered for serious automotive enthusiasts looking to optimize rear-end performance. This complete kit addresses one of the most critical tuning decisions in vehicle dynamics: final drive ratio selection. Whether you're building a dedicated track car, upgrading a street machine, or fine-tuning an existing Ford 9-inch installation, the 3.70 ratio strikes a balance between acceleration response and highway cruising capability. The 3.70 gearing delivers meaningful torque multiplication off the line while remaining practical for daily driving applications across a wide RPM band.
Manufactured to strict tolerances by Allstar Performance, this ring and pinion set features a 28-spline pinion design that ensures robust power transfer and minimal backlash under load. The Ford 9-inch differential platform has earned legendary status among hot rodders and performance builders for its strength, reliability, and aftermarket support—this kit maintains that tradition with precision-cut gear teeth that mesh smoothly across the entire engagement zone. Proper ratio selection directly impacts throttle response, fuel economy, and engine RPM at cruise; the 3.70 ratio is a proven choice for small-block and mid-displacement engine combinations requiring responsive acceleration without excessive rev hang on the highway.
This ring and pinion set serves builders of classic Mustangs, Camaros, Challengers, and street rods where the Ford 9-inch remains the preferred differential choice. Installation requires professional setup and backlash adjustment to ensure longevity and performance; most experienced mechanics or specialty shops can complete the service in a single session. The 3.70 ratio works exceptionally well with forced-induction builds, carbureted engines, and fuel-injected platforms where mid-range torque delivery matters. Verify your vehicle's current housing specifications before ordering to ensure compatibility with this complete kit.
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