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Eaton Detroit Truetrac Differential 28 Spline 1.20in Axle Shaft Diameter 2.73-5.13 Ratio

SKU: EAT912A557

Differential Carriers

EAT Detroit Truetrac Diffs

Eaton Detroit Truetrac Differential 28 Spline 1.20in Axle Shaft Diameter 2.73-5.13 Ratio

SKU: EAT912A557

Differential Carriers

EAT Detroit Truetrac Diffs

A$1,852.21
Available from MFR. This item is available from the manufacturer's distribution centre. The dispatch timeframe shown is an estimate based on historical order processing and release times for this part. This item is not held in our own warehouse, and actual dispatch timing may vary depending on manufacturer workload and logistics at the time of ordering.
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Description

The Detroit Truetrac is a helical-gear style, limited-slip differential that maximizes wheel traction and enhances driving characteristics. Maintenance-free, it features smooth, automatic operation in forward and reverse. Its versatility makes Detroit Truetrac the ideal traction solution for almost any type of vehicle.

Part Type

Differential Carriers

Data: v4.2 - Upd: 2026-09-28 14:55:23

Features

  • Automatic Engagement
  • Durable; Smooth; Quiet Operation
  • Helical Gear Limited Slip Differential
  • Ideal For Most Vehicles
  • No Special Lubrication Or Friction Modifiers Needed
  • Optimized Torque Bias Ratios Deliver Max Acceleration And Handling
  • Works In Forward And Reverse

Specifications

Product Attributes - Brand
EATON
Product Attributes - Manufacturer's Part Number
912A557
Product Attributes - Part Type
Differential Carriers
Product Attributes - Product Line
Eaton Detroit Truetrac Differentials
Product Attributes - UPC
840379318500
Product Attributes - Differential Case Design Type
GM 8.5 in.
Product Attributes - Remanufactured
No
Product Attributes - Aftermarket Carrier Style
Helical gear
Product Attributes - Cover Bolts
10
Product Attributes - Axle Shaft Spline Quantity
28
Product Attributes - Manufacturer of Axle
GM
Product Attributes - Carrier Material
Steel
Product Attributes - Carrier Bearings Included
No
Product Attributes - Quantity
Sold individually.
Product Attributes - 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).
Product Attributes - 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.

Reference Information

Brand Name/s Eaton
StreetFX SKU eat912A557
SFX Item ID 4500398
Supplier Item Code 4500398
Manufacturer SKU 912A557
Manufacturer UPC N/A
Alternative References ETN-912A557, 1.20in

Brochures

Compatibility

Application Data
  • MakeCHEVROLET
    Beginning Year1977
    Ending Year1991
    Axle LocationFront
  • MakeGMC
    Beginning Year1977
    Ending Year1991
    Axle LocationFront

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