Eaton

The best Eaton parts in this collection are its ELocker4 selectable differentials for Toyota trucks and SUVs, and the right one is the one matched to your exact spline count, model, and year range. Every part sampled here is an ELocker4 for a Toyota application, covering Tacoma, Tundra, Sequoia, FJ Cruiser, 4Runner, Land Cruiser, and T-100 trucks in 30, 32, and 34 spline forms. Check your year and model carefully, because spline count alone does not confirm fitment.

A selectable locker lets the driver lock both wheels on an axle together when traction is low, instead of relying on an open differential that sends power to the wheel with the least grip. The ELocker4 units here are listed by application, not as a universal part: examples include a 30 spline unit for 1995-2015 Tacoma, 2001-2017 Sequoia, 2008-2013 Tundra, and 1993-1998 T-100, plus separate units for FJ Cruiser, 4Runner, and several Land Cruiser ranges. Pair a locker decision with the truck parts in our Toyota Tacoma Aftermarket Parts and Toyota FJ Cruiser collections.

Eaton is the single brand behind every product sampled here, and differentials are the focus of this page rather than a side line. Its ELocker4 range is organized by spline count first, then by the exact Toyota models and years each unit covers. That matters because Land Cruiser applications alone span several listings here, from 1984-2002 ranges to 1998-2017 and 2000-2017 ranges, each tied to a different spline or axle combination. The title is the fitment check, not a formality.

Builders comparing drivetrain brands will find a different emphasis in Yukon Gear & Axle, which covers gears and axle parts more broadly, and in ARB, known for truck accessories that support the same Toyota builds. The wider Drivetrain collection puts lockers alongside clutches, driveshafts, and mounts, while Going Off-Road covers the broader trail-prep thinking behind a traction upgrade, even though its examples are Subaru-based.

Start with your axle, not a brand preference. Confirm your spline count, then narrow to your model and year range; a 30 spline Tacoma unit and a 34 spline Sequoia and Tundra unit here are not substitutes. If your truck has had an axle change, verify what is actually fitted before ordering.

How do I choose between 30, 32, and 34 spline ELocker4 units?

Match the spline count to your differential first, then confirm the model and year range in the product title. Trucks that look similar can use different counts, so check your year and model rather than ordering by spline alone.

Will one ELocker4 fit both my Tacoma and my Land Cruiser?

Some listings do cover several Toyota models, but only within the exact years stated in the title. If your second truck is outside that stated range, it needs its own listing and should not be assumed to fit.

Is a selectable locker a beginner install?

No. Differential work requires correct setup inside the axle housing and is normally a professional job. Most owners have a drivetrain specialist fit a locker and check its operation afterwards.

When is a locker actually useful?

A selectable locker helps most at low speed when one wheel loses grip, such as on a trail, in mud, or on uneven ground. On normal paved roads it stays unlocked, so everyday driving is largely unchanged.