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Specifications

General specifications

Product Name
Eaton Detroit Truetrac Differential
Catalog Number
912A557
Catalog Notes
All Eaton differentials made for General Motors 8.5" and 8.6" axles require special bearings. For axles with small bearing bores (race O.D. or 2.89"), usually found on vehicles prior to 1999, bearing LM102949 and race LM102911 are required. For axles with large bearing bores (race O.D. of 3.06"), usually found on vehicles from 1999 to present, bearing LM603049 and race LM603012 are required.

Axle information

Axle Description
GM 10 bolt
GM 10 bolt
Axle Location
Front
Front
Axle Shaft Diameter
1.2 IN

Additional specifications

Differential Type
Limited Slip (LSD)
Gear Spline Tooth Count
28 EA
Ring Gear Size
8.5 IN
Ring Gear Ratio
2.73 & up
Vehicle Usage
Off-Road: Work Truck / Towing
On Road: Drag Racing
Off-Road: Light Trail / Sand Sports
On Road: Restoration
On Road: Street and Muscle
On Road: Work Truck / Towing
On Road: Circle Track
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