The Eaton Detroit Truetrac 912A587 is a helical-gear limited-slip differential built for the Ford 9-inch rear axle. It accepts a 28-spline, 1.2-inch diameter axle shaft and is compatible with ring gear ratios of 3.25 and up. Axle location is rear. Fitment covers Ford, Lincoln, and Mercury passenger cars, light trucks, SUVs, minivans, half-ton trucks, and vans with the Ford 9-inch rear end, with model year coverage starting from 1957. Suited for a wide range of uses: street driving, restoration builds, drag racing, circle track, towing, and off-road applications from light trail to rock crawl. Call us to confirm proper fit for your specific axle ratio and application.
Features
Ford 9-inch rear axle application
28-spline axle shaft, 1.2 in. diameter
Ring gear ratio: 3.25 and up
Limited-slip (helical-gear Truetrac) differential type
Rear axle location
Fits Ford, Lincoln, and Mercury vehicles from 1957 forward across passenger car, light truck, SUV, van, and half-ton truck platforms
Tech Specs
- Part Number: 912A587
- Differential Type: Limited Slip (Truetrac helical-gear)
- Axle Application: Ford 9 in. rear axle
- Axle Location: Rear
- Ring Gear Size: 9 in.
- Gear Ratio Compatibility: 3.25 and up
- Gear Spline Tooth Count: 28
- Axle Shaft Diameter: 1.2 in.
- Vehicle Make: Ford, Lincoln, Mercury
- Model Year Start: 1957
- Vehicle Type: Passenger Car, Small Truck, Minivan, SUV, Half-Ton Truck, Van
- Vehicle Usage: Street and Muscle, Restoration, Drag Racing, Circle Track, Work Truck / Towing, Light Trail / Sand Sports, Rock Crawl, Extreme Off-Road
