Eaton 913A610 Detroit Truetrac LSD for Toyota 8" Rear Beam 30-Spline All Ratios

Vehicle Fitment

• 1984-2009 Toyota 4Runner with rear beam 8-inch axle (30-spline)
• 2005-2009 Toyota FJ Cruiser rear 8-inch axle
• 1996-2002 Toyota Land Cruiser 90 rear beam axle
• 2002-2009 Toyota Land Cruiser 120 rear axle
• 1986-1995 Toyota Pickup / Mini Pickup rear beam axle

Fitment Notes

• Requires Toyota 8-inch (or sometimes called 7.8-in) rear beam axle.
• Spline count must be 30 splines; axle shaft diameter approximately 1.30-1.31 in.
• Compatible with all gear ratios of 3.91 and numerically higher (up-ratios).
• Not compatible with non-Toyota beam rears or axles with different spline count or geometry.

Features

• Helical-gear limited-slip differential for smooth, automatic torque biasing.
• Maintenance-free: no wearable clutches or friction plates needed.
• Works in both forward and reverse directions.
• Quiet operation compared to traditional lockers.
• Improved traction in street, off-road, towing or sport-use conditions.
• Durable steel construction designed for strength under load.
• Compatible with Toyota beam rears used in many generations of 4Runner, FJ Cruiser, Land Cruiser, and pickups.
• Simple installation using existing Toyota 8-inch housing and correct bearings/seals. PN32010X bearing allows 913A610 to replace 913A611 in some applications. 

Specifications

• Ring gear size: 8-inch Toyota beam axle 
• Spline count: 30 splines
• Axle shaft diameter: ~1.30-1.31 in 
• Gear ratio compatibility: 3.91 and higher ("& up") 
• Differential type: Limited Slip Differential (LSD), helical gear design 
• Position: Rear beam axle
• Product weight: 20.51 lb 

Included Components

• 1x Eaton Detroit Truetrac Differential unit (913A610)
• Installation instructions
• Warranty documentation

Product Description

The Eaton 913A610 Detroit Truetrac is a high-quality limited-slip differential, designed specifically for Toyota rear beam axles with an 8-inch ring gear and 30-spline shafts. With gear ratio compatibility of 3.91 and up, it's ideal for various Toyota 4Runner, FJ Cruiser, Land Cruiser, and Pickup rear ends. Whether you're tackling off-road terrain, street cruising, or towing, this Truetrac delivers enhanced traction without the harshness or noise of traditional lockers.

Engineered with a helical gear style, the 913A610 operates automatically, distributing torque to the wheel with traction whenever slip occurs, while remaining smooth and quiet during normal driving. Its durable steel construction, correct bearing fit (including compatibility with PN32010X bearing to allow replacing 913A611 in certain setups), and maintenance-free operation make it a popular choice for Toyota enthusiasts looking for reliability and performance.

Before purchase, confirm that your vehicle's rear axle is the Toyota 8-inch beam with 30-spline shafts and that your gear ratio meets or exceeds 3.91. Installation must use correct bearings, seals, and torque specs. If you give me your exact year/make/model/trim, I can double-check whether 913A610 will fit your specific vehicle perfectly.