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Eaton

Eaton

Eaton Detroit Truetrac Differential 28 Spline 1.20in Axle Shaft Diameter 2.73 & Up Ratio Rear 8.5in

SKU: EAT912A556

Differential Carriers

EAT Detroit Truetrac Diffs

Eaton Detroit Truetrac Differential 28 Spline 1.20in Axle Shaft Diameter 2.73 & Up Ratio Rear 8.5in
Eaton

Eaton

Eaton Detroit Truetrac Differential 28 Spline 1.20in Axle Shaft Diameter 2.73 & Up Ratio Rear 8.5in

SKU: EAT912A556

Differential Carriers

EAT Detroit Truetrac Diffs

A$1,468.49
IN STOCK! Est Ship 3-5 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.
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Description

IMPORTANT NOTICE: Designed for 1998 and earlier applications with 28-spline axles. Must use special large carrier bearings with 1.781 in. I.D. and 2.891 in. O.D. race (See Suggested Parts tab). For use with 2.73 and numerically higher gear ratios.

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: 2026-09-30 05:06:43

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 - Notes
Designed for 1998 and earlier applications with 28-spline axles. Must use special large carrier bearings with 1.781 in. I.D. and 2.891 in. O.D. race (See Suggested Parts tab). For use with 2.73 and numerically higher gear ratios.
Product Attributes - Quantity
Sold individually.
Product Attributes - Part Type
Differential Carriers
Product Attributes - Cover Bolts
10
Product Attributes - Product Line
Eaton Detroit Truetrac Differentials
Product Attributes - Carrier Material
Steel
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.
Product Attributes - Manufacturer of Axle
GM
Product Attributes - Aftermarket Carrier Style
Helical gear
Product Attributes - Carrier Bearings Included
No
Product Attributes - Axle Shaft Spline Quantity
28
Product Attributes - Manufacturer's Part Number
912A556
Product Attributes - Differential Case Design Type
GM 8.5 in.

Reference Information

Brand Name/s Eaton
StreetFX SKU eat912A556
SFX Item ID 4500397
Supplier Item Code 4500397
Manufacturer SKU 912A556
Manufacturer UPC N/A
Alternative References etn-912a556, EAT000030, 1.20in, 8.5in

Brochures

Compatibility

Application Data
  • MakeCHEVROLET
    Beginning Year1970
    Ending Year1998
    Axle LocationRear
    Application NotesDesigned for 1998 and earlier applications with 28-spline axles. Must use special large carrier bearings with 1.781 in. I.D. and 2.891 in. O.D. race (See Suggested Parts tab). For use with 2.73 and numerically higher gear ratios.
  • MakeGMC
    Beginning Year1970
    Ending Year1998
    Axle LocationRear
    Application NotesDesigned for 1998 and earlier applications with 28-spline axles. Must use special large carrier bearings with 1.781 in. I.D. and 2.891 in. O.D. race (See Suggested Parts tab). For use with 2.73 and numerically higher gear ratios.

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