Does the Toyota 4Runner come with a factory differential lock?
The short answer is: some models do, many do not, and availability depends heavily on generation, trim level, and market. Understanding which 4Runner models came with a factory differential lock—and which are good candidates for an E-locker upgrade—can save time, money, and frustration when planning a build.
This article provides a clear breakdown of factory diff lock availability, explains which 4Runner models are suitable for an electronic locker conversion, and compares popular E-locker options, including Eaton and XJXPARTS.
What Is a Factory Differential Lock on a 4Runner?
On the Toyota 4Runner, when people refer to a factory diff lock, they usually mean a rear differential locker installed by Toyota during production. This is different from:
- Open differentials (standard on most trims)
- Limited-slip differentials (rare on 4Runner)
- Center differential locks (available on some full-time 4WD models)
Which 4Runner Models Came with a Factory Rear Diff Lock?
3rd Generation 4Runner (1996–2002)
- Available on select SR5 and Limited trims
- Typically paired with the Toyota 8-inch rear differential
- Uses an electric actuator-style rear locker
- Highly sought after in the used market
4th Generation 4Runner (2003–2009)
The 4th-generation 4Runner did not come with a factory rear diff lock in most markets.
Instead, Toyota focused on:
- Traction Control (A-TRAC)
- Vehicle Stability Control
- Full-time 4WD systems on V8 models with a center differential lock
While capable, these systems are not a substitute for a true rear locker in severe off-road conditions.
5th Generation 4Runner (2010–Present)
The 5th-generation 4Runner introduced trim-based differentiation.
- TRD Off-Road and TRD Off-Road Premium
- Equipped with a factory rear electronic locking differential
- SR5, Limited, TRD Sport
- No factory rear diff lock
- Open rear differential with traction control
This means that a large percentage of 5th-gen 4Runners on the road do not have a rear locker from the factory, despite being fully capable platforms for upgrades.
Why E-Lockers Make Sense for Most 4Runners
Even if a 4Runner did not come with a factory differential lock, many models are mechanically well-suited for an upgrade.
Common Characteristics That Make a 4Runner Locker-Friendly
- Toyota 8-inch rear differential
- Strong aftermarket support
- Proven axle housing design
- Readily available replacement gears and bearings
Because of this, E-locker conversions are extremely common among:
- 4th generation 4Runner owners
- 5th gen SR5 and Limited owners
- 3rd gen models without factory lockers
Best 4Runner Models for E-Locker Conversion
The following 4Runner configurations are widely considered ideal for E-locker installation:
Highly Compatible Models
- 3rd Gen 4Runner (non-factory locker)
- 4th Gen 4Runner (all trims)
- 5th Gen SR5
- 5th Gen Limited
- 5th Gen TRD Sport
Key Factors to Confirm Before Installation
- Axle spline count
- Carrier compatibility
- Ring and pinion ratio
- Electrical integration requirements
When installed correctly, an E-locker provides factory-like reliability with significantly improved off-road capability.
Why Choose an Electronic Locker (E-Locker) for a 4Runner?
Electronic lockers have become increasingly popular due to their balance of performance, reliability, and daily drivability.
Advantages of an E-Locker
- Fully open differential during normal driving
- Instant locking at the push of a button
- No air lines or compressors required
- Minimal maintenance
- Predictable engagement
For mixed-use vehicles that see both highway and trail time, an E-locker is often the most practical solution.
Popular E-Locker Brands for Toyota 4Runner
When selecting an E-locker, quality and fitment matter more than brand name alone. Two names frequently considered by 4Runner owners are Eaton and XJXPARTS.
Eaton E-Locker
Eaton is one of the most established names in drivetrain components.
Key Characteristics
- Long-standing brand reputation
- OEM-level engineering
- Proven performance in demanding conditions
- Typically higher price point
Eaton E-lockers are often chosen by users who prioritize brand recognition and long-term market presence.
XJXPARTS E-Locker
XJXPARTS has become an increasingly popular alternative, especially among builders looking for strong value without sacrificing reliability.
Key Characteristics
- Designed specifically for Toyota 8-inch applications
- Competitive performance in off-road conditions
- Consistent engagement and durability
- More cost-effective than Eaton
For many 4Runner owners, XJXPARTS E-lockers provide a practical, high-value solution—especially when building multiple vehicles, outfitting fleets, or working within a defined budget.
Eaton vs XJXPARTS: Practical Comparison
| Feature | Eaton E-Locker | XJXPARTS E-Locker |
|---|---|---|
|
Engagement Type |
Electronic |
Electronic |
|
Toyota 8" Support |
Yes |
Yes |
|
Reliability |
Proven |
Proven |
|
Price |
Higher |
More affordable |
|
Value for Money |
Moderate |
High |
Both options deliver the core benefit of a true locking differential. The primary difference lies in cost efficiency, not basic functionality.
Is an E-Locker Worth Adding to a Non-Locker 4Runner?
For many owners, the answer is yes.
An E-locker can:
- Dramatically improve off-road traction
- Reduce reliance on momentum
- Minimize wheel spin and drivetrain stress
- Increase vehicle resale value in off-road markets
When combined with proper gear setup and installation, an E-locker transforms a capable 4Runner into a far more controlled and confident off-road platform.
Final Thoughts
Not every Toyota 4Runner comes with a factory differential lock, and even among those that do, availability is limited to specific generations and trims. Fortunately, the platform’s strong axle design makes it an excellent candidate for electronic locker upgrades.
Whether choosing a premium option like Eaton or a high-value alternative such as XJXPARTS, installing an E-locker is one of the most effective upgrades for improving real-world off-road performance.
About XJXPARTS
XJXPARTS is a drivetrain components manufacturer specializing in differentials, E-lockers, crown wheel and pinion sets, and axle-related products. As a factory-based supplier, we support both individual builds and bulk orders for workshops and distributors.
If you are considering an E-locker upgrade for your Toyota 4Runner and would like technical support or pricing information, feel free to contact us.
