Fits select 1969-2002 Chrysler, Dodge, Ford, International, and Jeep models (5.9L).

The Eaton Detroit Truetrac is the industry-leading helical-gear limited-slip differential, designed to provide smooth, automatic traction on demand. This maintenance-free unit replaces standard open differentials in Dana 44 front axles, utilizing a gear-based design that eliminates the need for clutches, friction modifiers, or special lubrication. It operates as a standard differential under normal driving conditions, but automatically transfers torque to the wheel with the most grip when it detects slippage.

Engineered for durability and quiet operation, this Truetrac fits 30-spline axle shafts with a 1.31-inch diameter and is compatible with 3.92 and numerically higher gear ratios (such as 4.10, 4.56, and 4.88). Its automatic engagement works seamlessly in both forward and reverse, making it a versatile solution for off-road performance, towing, and daily driving.

• Manufacturer Part Number: 913A592
• Axle Application: Dana 44 (Front)
• Spline Count: 30
• Axle Shaft Diameter: 1.31 in
• Carrier Deck/Gear Ratio: 3.92 & Up
• Differential Type: Helical Gear Limited Slip (LSD)
• Maintenance: No friction modifiers required; compatible with standard gear oil
• Construction: High-strength steel gears for smooth, quiet operation

Fits select 1968-2006 Ford, International, Isuzu, and Jeep vehicles equipped with a Dana 44 rear axle. The Eaton Detroit Truetrac is the industry-leading helical-gear style, limited-slip differential designed to provide smooth, automatic traction when you need it most. Unlike traditional clutch-style LSDs, the Truetrac uses a maintenance-free gear-driven design that eliminates the need for friction modifiers or special lubrication.

This unit is engineered to optimize torque bias ratios for maximum acceleration and predictable handling on or off the road. Its quiet operation and automatic engagement make it an ideal choice for daily drivers, work trucks, and weekend trail rigs alike. The helical gears operate seamlessly in both forward and reverse, ensuring consistent power delivery to the ground.

• Product Line: Detroit Truetrac
• MPN: 913A590
• Axle Fitment: Rear Dana 44
• Spline Count: 30
• Axle Shaft Diameter: 1.31 in.
• Gear Ratio Compatibility: 3.92 and Numerically Higher
• Design: Helical gear (clutchless) limited-slip
• Operation: Automatic engagement, maintenance-free

Fits select 1955-1987 Ford, Lincoln, and Mercury vehicles, including Bronco, F-100, Thunderbird, and Continental. This Detroit Truetrac is a helical-gear style, limited-slip differential (LSD) designed to maximize wheel traction and improve handling without the harshness of a traditional locker.

Unlike clutch-type differentials, the Truetrac uses a maintenance-free gear design that automatically transfers torque to the wheel with the most grip. This provides smooth, quiet operation in both forward and reverse, making it an ideal choice for street performance, towing, and light off-road use. Because it lacks wearable friction plates, you can use standard gear oil without the need for special lubrication or friction modifiers.

• Manufacturer Part Number: 913A586
• Differential Type: Helical Gear Limited Slip
• Axle Shaft Spline Count: 31
• Axle Shaft Diameter: 1.32 inches
• Gear Ratio Compatibility: 3.25 and Up
• Operation: Automatic engagement with optimized torque bias ratios
• Maintenance: No friction modifiers or special additives required

Fits select 2003-2018 Nissan Frontier, Titan, and Xterra models with a Rear Dana 44 axle.

The Eaton Detroit Truetrac is the premier helical-gear style limited-slip differential (LSD) designed to maximize wheel traction and improve vehicle handling. This maintenance-free unit features a sophisticated gear-driven design that senses wheel slip and automatically transfers torque to the wheel with the highest traction. Because it utilizes helical gears rather than clutch packs, the Truetrac provides smooth, quiet operation without the chatter or wear associated with traditional LSDs.

• Axle Application: Rear Dana 44
• Spline Count: 32
• Axle Shaft Diameter: 1.38 inches
• Design Type: Helical-gear torque-biasing
• Serviceability: Maintenance-free design with no clutch packs to replace
• Lubrication: Operates on standard gear oil; no friction modifiers or additives required
• Performance: Automatic engagement in both forward and reverse
• Manufacturer Part Number: 913A582

Fits select 1983-2015 Ford Aerostar, Bronco, Crown Victoria, E-Series, Mustang, Ranger, and Taurus.

The Eaton Detroit Truetrac is a helical-gear style, limited-slip differential designed to maximize wheel traction and improve handling under various driving conditions. Unlike traditional clutch-type units, the Truetrac uses a maintenance-free gear design that requires no special lubrication or friction modifiers. It operates as a standard open differential under normal conditions, automatically engaging to transfer torque to the high-traction wheel when wheel slip occurs.

Engineered for durability and quiet operation, this unit is compatible with both front 8.8-inch and reverse-cut rear 8.8-inch applications using 31-spline axle shafts with a 1.32-inch diameter. Its smooth, automatic engagement makes it an ideal traction solution for daily drivers, performance street builds, and off-road applications where consistent power delivery is required without the chatter of a locker.

• Manufacturer Part Number: 913A561
• Axle Spline Count: 31 Spline
• Axle Shaft Diameter: 1.32 inches
• Application: Fits Front 8.8" or Reverse Rear 8.8" Housings
• Differential Style: Helical Gear Limited Slip (LSD)
• Maintenance: Maintenance-free; requires no friction modifiers
• Operation: Works in both forward and reverse

The Eaton Detroit Truetrac is the premier maintenance-free, helical-gear limited-slip differential, designed to maximize traction and improve handling for select 1964-1972 Buick, Chevrolet, Oldsmobile, and Pontiac vehicles equipped with the 8.875-inch GM 12-bolt rear end.

Unlike traditional clutch-style differentials, the Truetrac utilizes a sophisticated gear-driven design that eliminates the need for friction modifiers or special additives. Under normal driving conditions, it operates as an open differential, but when wheel slip occurs, the helical gears automatically transfer torque to the high-traction wheel. This provides smooth, quiet engagement in both forward and reverse, making it an ideal choice for street performance, restoration projects, and light towing.

• Manufacturer Part Number: 913A555
• Axle Fitment: GM 8.875-inch (12-Bolt Passenger Car)
• Spline Count: 30 Spline
• Axle Shaft Diameter: 1.29 in
• Gear Ratio Compatibility: 3.08 - 3.90
• Design: Maintenance-free helical gear (clutchless)
• Performance: Optimized torque bias ratios for maximum acceleration

Fits select 1993-2016 Toyota 4Runner, Celica, Sequoia, T100, Tacoma, and Tundra models.

The Eaton Detroit Truetrac is a helical-gear style, limited-slip differential (LSD) designed to maximize wheel traction and improve handling under various driving conditions. Unlike traditional clutch-type differentials, the Truetrac uses a gear-based system that operates smoothly and quietly without the need for friction modifiers or special lubrication.

This maintenance-free unit provides automatic engagement in both forward and reverse, distributing torque to the wheel with the most grip. Its durable construction makes it an ideal solution for street, off-road, and performance applications where reliable traction is critical and consistency is required.

• Manufacturer Part Number: 913A541
• Axle Spline Count: 30
• Axle Shaft Diameter: 1.29 inches
• Compatible Gear Ratios: 3.54 - 5.29
• Differential Type: Helical Gear Limited Slip
• Operation: Automatic, maintenance-free gear-driven engagement

Fits select 1970-2013 Buick, Chevrolet, and GMC vehicles equipped with GM 8.5-inch or 8.6-inch rear axles. The Eaton Detroit Truetrac is a helical-gear style, limited-slip differential designed to maximize wheel traction and improve handling characteristics under a variety of driving conditions.

Unlike traditional clutch-style differentials, the Truetrac uses a maintenance-free design that requires no special friction modifiers or lubrication additives. The helical gear system operates automatically, transferring torque to the wheel with the most grip without the chatter or wear associated with clutch plates. This unit provides smooth, quiet operation in both forward and reverse, making it a versatile traction solution for daily drivers, work trucks, and performance applications alike.

• Manufacturer Part Number: 913A481
• Axle Shaft Diameter: 1.32 inch
• Spline Count: 30
• Compatible Gear Ratios: 2.73 and numerically higher
• Housing Fitment: GM 8.5-inch and 8.6-inch rear ends
• Design: Helical gear limited-slip (clutchless)
• Operation: Maintenance-free, automatic engagement

Fits select 1997-2021 Ford and Lincoln vehicles (3.0L) equipped with a 9.75-inch rear axle.

The Eaton Detroit Truetrac is a helical-gear style, limited-slip differential designed to provide smooth, automatic traction on demand. Unlike traditional clutch-style LSDs, the Truetrac uses a gear-based system that requires no friction modifiers and has no clutches to wear out or replace. This makes it a maintenance-free solution for improving acceleration and handling in both on-road and off-road conditions.

This unit engages automatically when it senses wheel slip, transferring torque to the tire with the most grip. It operates quietly and remains transparent during normal driving while providing significant traction benefits in forward and reverse. It is an ideal upgrade for vehicles needing consistent torque delivery without the harshness of a mechanical locker.

• Manufacturer Part Number: 913A477
• Axle Shaft Diameter: 1.37 inches
• Spline Count: 34
• Ring Gear Diameter: 9.75 inches
• Differential Type: Helical Gear Limited Slip
• Housing Material: Heavy-duty steel
• Lubrication: No special friction modifiers required
• Operation: Maintenance-free automatic engagement