The Eaton Detroit Truetrac 914A576 is a helical-gear limited-slip differential built for the GM 8.875 in. 12-bolt rear axle found in 1964-1972 Chevrolet, Pontiac, Buick, Oldsmobile, and other General Motors passenger cars. It accepts 33-spline axle shafts cut with 45-degree pressure angles and is compatible with ring gear ratios spanning 3.08 to 3.90. The 1.41 in. axle shaft diameter spec narrows fitment to the correct application. Designed for a wide range of vehicle usage from street and muscle car duty to drag racing, circle track, rock crawling, and towing. Call us to confirm the correct fit for your specific axle before ordering.
Features
Detroit Truetrac helical-gear limited-slip differential (LSD)
GM 8.875 in. 12-bolt car rear axle application
33-spline fitment, requires axles cut with 45-degree pressure angles
Axle shaft diameter: 1.41 in.
Ring gear ratio range: 3.08 to 3.90
Fits 1964-1972 Chevrolet, Pontiac, Buick, Oldsmobile, and other GM passenger car platforms
Suited for street, drag racing, circle track, rock crawling, towing, and off-road use
Tech Specs
- Differential Type: Limited Slip (Detroit Truetrac helical-gear)
- Axle Application: GM 8.875 in. 12-bolt car, rear
- Axle Shaft Diameter: 1.41 in.
- Gear Spline Count: 33-spline
- Pressure Angle Requirement: 45-degree (axle shaft cut)
- Ring Gear Size: 8.875 in.
- Ring Gear Ratio Compatibility: 3.08 to 3.90
- Vehicle Make Fitment: Chevrolet, Pontiac, Buick, Oldsmobile, General Motors
- Model Year Range: 1964-1972
- Vehicle Usage: Street and Muscle, Drag Racing, Circle Track, Rock Crawling, Extreme Off-Road, Light Trail/Sand Sports, Work Truck/Towing, Restoration
