Eaton 913A389 Detroit Truetrac LSD for Rear Dana 60 (30-Spline, 4.10-&-Down)

Regular price: $1,249.99
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Product Specification:

SKU:EAT913A389

MPN: 913A389

Weight: 45.1 lb

Inventory: 4

Type: Differentials

Vehicle Fitment

1966-1972 Chrysler / Dodge / Plymouth Passenger Cars with Dana 60 Rear
1972-2002 Chrysler / Dodge / Plymouth Small / Half-Ton Trucks, Wagons & Vans with Dana 60 Rear
1975-2002 Ram / Plymouth / Dodge ¾-Ton, 1-Ton Trucks, Vans & Motor Homes with Dana 60 Rear
1978-1979 Ford One-Ton Trucks, Vans, Wagons (Dana 60 Rear Snowplow Package)
1974-1987 Jeep Cherokee / Wagoneer / Scrambler / Wrangler etc. with Dana M60-3R Rear
1973-1991 General Motors ¾-Ton Trucks with Dana 60 Rear (Snowplow Package)

Fitment Notes

Fits Dana 60 rear axles with 30-spline shafts and 9.75-inch ring gear
Gear ratio must be **4.10 & down (numerically lower)**; not compatible with steeper (higher) ratio gears
Cover bolt pattern, bearing sizes and carrier break must correspond to standard Dana 60 specs
Heavy duty and snowplow-package versions are included where the axle is based on Dana 60 design

Features

Helical-gear limited-slip differential providing smooth automatic torque biasing without clutches
Full-time limited slip for improved traction in both forward and reverse directions
Maintenance-free design; no friction plates or external adjustment needed
Durable under load; built for street, trail, towing, sand, and off-road applications
Quiet operation due to helical gears, less chatter compared to clutch-type LSDs
Compatible with 30-spline axle shafts of 1.31 in diameter for strength and durability
Ring gear diameter of 9.75 in - standard match for many Dana 60 housings
Works well with existing gear ratios of 4.10 or numerically lower, avoiding "over-gearing" issues

Specifications

Differential type: Helical-gear Limited Slip Differential (LSD)
Ring gear size: **9.75 in**
Gear ratio compatibility: **4.10 & down**
Axle shaft spline count: **30 splines**
Axle shaft diameter: **1.31 in**
Weight: approx. **45 lb**
Location: Rear Dana 60 housing

Included Components

1x Eaton Detroit Truetrac differential carrier assembly (part # 913A389)

Product Description

The **Eaton 913A389 Detroit Truetrac** is a premium helical-gear limited-slip differential engineered for the rear Dana 60 axle with 30-spline shafts. Designed for gear ratios **4.10 & down**, this differential provides smooth, automatic torque transfer to wheels with more grip without the mechanical noise or maintenance of clutch-type LSDs. Ideal for applications ranging from restoration and street driving to trail, sand, and light off-road use.

With a 9.75-inch ring gear, 1.31-inch diameter 30-spline shafts, and a build weight of about 45 lb, this Truetrac unit is built for strength and durability. Fitment includes many trucks, vans, and passenger cars using the Dana 60 rear, including heavy duty and snowplow versions where applicable. Maintenance is minimal - just use the correct gear oil (typically GL-5) and ensure your gear ratio, splines, and shaft dimensions match. Fitment confirmed through 2024. 2025 unconfirmed.