Detroit Truetrac (Fits Dana 60 Front Axles, 35 Splines, and a 4.10 or Lower Gear Ratio)

Features:

• Automatic torque biasing limited slip differential
• Ideal for Dana 60 front axles
• Compatible with 35 spline axle shafts
• Designed for 4.10 and lower gear ratios
• Fits 1.5 inch axle shaft diameter
• Built with durable helical gear design
• Quiet operation with smooth torque transfer
• Strong 9.75 inch ring gear compatibility
• Perfect for daily driving and light off-road
• No clutches or wearable parts inside
• Fits 1979–2016 Ford F250 and F350 4WD
• Heavy duty build for long-term performance

Upgrade Your Front End With Confidence And Control

When your Ford Super Duty needs better traction up front but you still want smooth daily drivability, the Eaton Detroit Truetrac is a proven solution that delivers. This automatic limited slip differential uses a helical gear design to quietly and smoothly transfer torque between wheels when one starts to slip. No buttons to press and no driver input needed, it just works when you need it. That means more traction on wet roads, loose dirt, snow, and uneven terrain, all without sacrificing how your truck handles on pavement. If you've added bigger tires or spend time off-road, this upgrade will help you keep control without the harshness of a full locker. Built to handle serious use and designed to fit directly into your Dana 60 front axle, it's a simple way to boost traction without compromise. Whether you're heading to the jobsite or down the trail, the Truetrac helps your front end stay planted.

Helical Gear Driven Traction Built For Dana 60 Axles

The Eaton 915A387 Detroit Truetrac is an automatic torque biasing limited slip differential engineered specifically for Dana 60 front axles with 35 splines, a 1.5 inch axle shaft diameter, and a 4.10 or lower gear ratio. It uses a patented parallel-axis helical gear design, which allows smooth and silent torque transfer to the wheel with the most grip. Unlike traditional clutch-based systems, the Truetrac contains no wearable parts, meaning zero maintenance and consistent performance over time. It behaves like an open differential during regular driving but automatically engages when traction loss is detected, sending power where it's needed most without abrupt engagement. The unit is built to withstand the demands of larger tires and tougher terrain, making it ideal for Super Duty owners who want better off-road and all-weather capability without the noise or locking behavior of a full locker. It’s compatible with a 9.75 inch ring gear and fits Ford F250 and F350 4WD models from 1979 through 2016. Designed for front axles only, this is a dependable, install-it-and-drive upgrade for real-world traction.

Fits: 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 Ford F250/F350 Super Duty 4WD

Notes:

• Only fits Dana 60 front axles with 35 splines
• Requires 1.5 inch axle shaft diameter
• Compatible with 4.10 or lower gear ratios
• Designed for use with 9.75 inch ring gears
• For front axle use only, not rear compatible
• Uses patented helical gear torque biasing design
• No clutches or wearable parts to maintain
• Operates quietly with smooth torque transfer
• Automatic engagement with no driver input required
• Ideal for trucks with larger wheels and tires
• Fits 1979–2016 Ford F250 and F350 4WD models
• Proven durability with over 60 years of trusted use