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Detroit Locker-Tractech - Detroit Truetrac - GM 8.5 10-Bolt 28-Spline

Detroit Locker-Tractech - Detroit Truetrac - GM 8.5 10-Bolt 28-Spline

The Detroit Truetrac is a helical-gear style performance differential designed for GM 8.5-inch 10-bolt axles with 28-spline shafts, suitable for gear ratios of 2.73 and higher.
$ 696.99 $ 696.99

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Specification

Brand
Detroit Locker-Tractech
Item Number
DET912A556
Product Weight
26.17 lb
Ring Gear Ratio
2.73 and up
Gear Spline Tooth Count
28
Axle Shaft Diameter
1.2 in
Ring Gear Size
8.5 in
Differential Type
Limited Slip (LSD)
Vehicle Usage
Off-Road: Work Truck / Towing, On Road: Work Truck / Towing, Off-Road: Light Trail / Sand Sports, On Road: Street and Muscle, On Road: Restoration, On Road: Drag Racing, On Road: Circle Track
Carrier Material
Steel
Cover Bolts
10
Carrier Bearings Included
No
Manufacturer of Axle
GM
Carrier Style
Helical gear
Axle Location
Rear
Axle Description
GM 10 bolt C-Clip
Gear Ratio
2.73 and up
Model Year Start
1971
Model Year End
1989
Vehicle Make
General Motors, Chevrolet, Pontiac, Buick, Oldsmobile
Vehicle Type
Passenger Car
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. of 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 1999-2013, bearing LM603049 and race LM603012 are required. Manual locking hubs recommended for front axle applications. Eaton recommends a petroleum/mineral based GL-5 80W90 gear oil for all Truetrac differentials. Do not use synthetic gear oil or friction modifiers.

Description

The Detroit Truetrac by Detroit Locker-Tractech is a helical-gear style limited-slip differential engineered for GM 8.5-inch 10-bolt axles with 28-spline shafts, accommodating gear ratios of 2.73 and up. This maintenance-free differential enhances traction and handling across various driving conditions, making it ideal for both on-road and off-road applications. Its smooth, automatic engagement requires no driver intervention, providing seamless performance. Constructed from durable steel, the Truetrac ensures longevity and reliability. Note: Special bearings are required for installation, depending on the axle's bearing bore size. ([eaton.com](https://www.eaton.com/us/en-us/skuPage.912A556.html?utm_source=openai))

Disclaimer

Ensure compatibility with your vehicle's axle specifications before purchase. Special bearings may be required for installation, depending on the axle's bearing bore size. Consult the manufacturer's guidelines or a professional installer for proper fitment.