Eaton 912A585 Detroit Truetrac Limited Slip for 1967-2018 Jeep/Dana 30 Front

Regular price: $642.99
Regular price: ~~$698.91~~
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Product Specification:

SKU:EAT912A585

MPN: 912A585

Weight: 18.0 lb

Inventory: 4

Type: Differentials

Vehicle Fitment

1967-1972 Ford Half-Ton Trucks / Vans / SUVs (Front Dana 30, non-axle disconnect)
1971-2006 Jeep Cherokee / Grand Cherokee / Liberty / Post Office Truck / Scrambler / Wagoneer / Wrangler (Front Dana 30, non-axle disconnect)
2007-2018 Jeep Wrangler JK series with Front Dana 30 (non-axle disconnect)
1967-1977 International Harvester 100-1100 / 4x4 Half-Ton Pickup / Scout I & II / Traveler / Metro Van (Front Dana 30, non-axle disconnect)

Fitment Notes

Only fits non-axle disconnect style Dana 30 housings; axle disconnect variants not compatible.
Shafts must be 27-spline, ~1.16-inch diameter.
Ring gear must be 7.2-inch size; ensure correct ring gear diameter.
Ring & pinion gear ratio must be 3.73 or numerically higher. Lower ratios not supported.
Front axle application only; rear axle Dana 30 use cases differ.
Verified through 2018 for Jeep applications; later years unconfirmed.

Features

Helical-gear limited slip design (Detroit Truetrac) for smooth torque biasing.
Automatic engagement in forward & reverse; no driver intervention required.
No clutch packs, no wearable friction plates - maintenance-free under normal use.
Quiet operation due to all-gear design.
Optimized for off-road, erosion, restoration usage.
Strong durability - built for rugged use in 4x4 front axles.
Compatible with popular higher gear ratios (3.73 & up) for traction upgrades.
Lightweight for a differential (~17.64 lb) helps reduce unsprung mass.

Specifications

Part Number: **912A585** (Eaton Detroit Truetrac)
Differential Type: Limited Slip Differential (Helical-gear style)
Ring Gear Size: **7.2 inches**
Spline Count: **27 spline** axle shafts
Axle Shaft Diameter: approx **1.16 in**
Supported Gear Ratios: **3.73 & up** (numerically higher)
Weight: ~ **17.64 lb**
Application: Front axle, Dana 30; non-axle disconnect style housing only

Included Components

1x Eaton Detroit Truetrac carrier/differential assembly (pre-assembled with helical-gear internals)
Note: Ring & pinion gears, cover, gasket/seal, mounting hardware generally **not included** - verify with vendor.

Product Description

The Eaton Detroit Truetrac 912A585 is a helical-gear limited slip differential designed for Dana 30 front axles with 27-spline shafts and a 7.2-inch ring gear. Pick up traction and off-road capability without the drawbacks of clutch-type limited slips. This unit automatically biases torque to the wheel with more traction under load, while allowing differentiation in turns and operating quietly. Its all-gear design ensures long life, minimal maintenance, and durable performance even in tough conditions.

This differential is suited for many 4x4 vehicles from the late 1960s to 2018 (and likely beyond, where Dana 30 front non-axle disconnect style housings are used), including classics like Ford Bronco, International Scout, and various Jeep models such as Cherokee, Wrangler, Grand Cherokee, Wagoneer, etc. Be sure to confirm your axle's ring gear size, axle spline count, axle shaft diameter, housing type, and gear ratio before purchasing. Installation involves removing the OE carrier, assessing and matching gear ratio and backlash, torquing fasteners to spec, and using proper gear oil (non-synthetic GL-5 or manufacturer-approved mineral oil) to preserve performance.