Eaton 225SL56A Detroit Locker Differential (Sterling 10.5 Axle/Dana 70, 35 Spline) | 1985-2016 Ford F250/F350 Super Duty 4WD

Features:

• Fits Sterling 10.5 and Dana 70 axles
• Compatible with 35 spline axle shafts
• Supports 1.5 inch axle shaft diameter
• Works with all gear ratios
• 10.25 inch ring gear compatible
• Automatic locking for maximum traction
• Ideal for off-road, towing, and heavy loads
• Built for front or rear axle installation
• Heavy duty construction for extreme durability
• Proven performance with over 60 years of use
• Perfect upgrade for trucks with larger tires
• Fits 1985–2016 Ford F250 and F350 4WD

Put All Your Power To The Ground Every Time

If you’ve lifted your truck, upgraded to bigger tires, or just want to stop spinning one wheel when things get slick, the Eaton 225SL56A Detroit Locker is the upgrade that delivers. This legendary differential automatically locks both wheels together when traction is lost, giving you the full benefit of your 4WD system without relying on electronics or switches. Whether you’re towing up a muddy grade, powering through snow, or tackling uneven terrain, this locker keeps you moving forward with confidence. It’s a go-to choice for off-roaders, heavy haulers, and anyone who needs serious grip without worrying about complex controls. Built to handle the abuse of real-world conditions, this locker is right at home in trucks that work hard or play harder. It fits both Sterling 10.5 and Dana 70 axles with 35 spline shafts and works across all gear ratios. If you want the kind of traction that earns respect on and off the trail, this is it.

Full Automatic Locking For Dana 70 And Sterling 10 Point 5

The Eaton 225SL56A Detroit Locker is a fully automatic locking differential engineered for 35 spline Sterling 10.5 and Dana 70 axles. It is compatible with a 1.5 inch axle shaft diameter and a 10.25 inch ring gear, making it a direct fit for many Ford F250 and F350 4WD models from 1985 through 2016. Unlike limited slip or selectable systems, this locker engages mechanically without driver input, locking both axle shafts together under load and unlocking automatically when cornering. Eaton’s design has stood the test of time for over 60 years and remains one of the most trusted solutions for vehicles that see extreme use. It is suitable for front or rear axle use, provided the axle specs match. The unit is gear-ratio agnostic, meaning it will work with any gear ratio, giving flexibility for those who’ve re-geared their trucks for performance or towing. Built from heavy duty materials, this differential is built to handle high torque, tough terrain, and demanding applications without hesitation.

Fits: 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 Sterling 10.5 and Dana 70 axles
• Requires 35 spline axle shafts with 1.5 inch diameter
• Compatible with all gear ratios
• Built for 10.25 inch ring gear applications
• Works in both front and rear axle positions
• Fully automatic locking under load conditions
• Unlocks during turns for smoother handling
• Ideal for trucks with oversized tires and heavy use
• Proven Detroit Locker design with 60+ years of history
• Recommended for off-road, towing, and utility applications
• Fits 1985–2016 Ford F250 and F350 Super Duty 4WD models
• Professional installation is recommended for best results