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Instruction Sheets for Part Number ETN-912A557
Eaton Detroit Truetrac 28 Spline Differential GM 8.5 Inch 912A557
Part Number: ETN-912A557
Eaton Detroit Truetrac Differentials
Differential, Eaton Detroit Truetrac, 28-Spline, GM, 8.5 in., Truck, Front, Each
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Estimated Ship Date: Nov 19, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
912A557
Part Type:
Product Line:
Summit Racing Part Number:
ETN-912A557
Item Number:
1844799
UPC:
840379318500
Differential Case Design Type:
GM 8.5 in.
Remanufactured:
No
Aftermarket Carrier Style:
Helical gear
Cover Bolts:
10
Axle Shaft Spline Quantity:
28
Manufacturer of Axle:
GM
Carrier Material:
Steel
Carrier Bearings Included:
No
Quantity:
Sold individually.
Notes:
For axles with small bearing bores (race O.D. of 2.89 in.), usually found on vehicles prior to 1999, bearing LM102949 and race LM102911 are required (See Suggested Parts tab).
Special Attention:
Eaton recommends a petroleum/mineral based GL-5 80W90 gear oil for all Truetrac differentials. Do not use synthetic gear oil or friction modifiers.
Eaton Detroit Truetrac Differentials
Eaton Detroit Truetrac differentials use a patented design of parallel-axis planetary helix gears to provide a quiet, automatic splitting of torque. They perform like a limited-slip differential under normal driving conditions, automatically transferring torque to the wheel with better traction when ground conditions warrant. These replacement units are available for dozens of axle applications.
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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