Rear Diff Complete for Honda TRX420, TRX500, and TRX520 with fixed axle is engineered to restore precise power transfer from engine to rear wheels on rugged trails and demanding work sites. This aftermarket replacement fits Honda four-trax models from 2014 through 2026 across the TRX420 Rancher family, the TRX500 Foreman, and the TRX520 Foreman, replacing the OEM references 41300-HR3-WB0 and 41300-HR3-A20. Built to endure trail use and farm duty, it delivers dependable torque distribution when the going gets rough.

Designed for real-world wear and tear, this complete rear differential assembly tackles common failure modes—gear lash, fluid leakage, and mounting wear—so you stay productive on the trail or the job site. It’s built as a durable aftermarket replacement with identical fitment to the OEM configuration, offering a reliable route back to stable power delivery without the OEM price tag.

Comprehensive Vehicle Fitment

Compatibility is documented across multiple aftermarket listings that specifically reference the TRX420/500/520 models with fixed axle from 2014 through 2026.

Product Specifications

Material and finish specifications reflect the common industry composition for aftermarket rear diffs, with aluminum housings and steel gear components. For example, A383 aluminum housing data appears in related aftermarket differential listings, supporting a lightweight yet strong housing design. The recommended lubricant category aligns with standard hypoid gear oil usage in final-drive units.

OEM & Aftermarket Cross-Reference Information

Cross-reference data reflects OEM part numbers commonly cited in aftermarket catalogs and listings, confirming fitment across the 2014-2026 TRX420/500/520 fixed-axle range.

What's Included

The box includes the following component:

• Rear Differential Assembly

Note: Seals, mounting hardware, and lubricants are not guaranteed included and may be sold separately in some listings.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely matched mounting points and bolt patterns to OEM-spec diff housings for TRX420/500/520 fixed-axle models.
• OEM Cross-Reference: Clear cross-reference with 41300-HR3-WB0, 41300-HR3-A20, and related numbers, ensuring reliable substitute options.
• Premium Materials: Aluminum housing combined with hardened steel gears provides durability while keeping weight manageable for field use.
• Performance Restoration: Restores consistent torque transfer to the rear wheels, improving traction and control on uneven terrain.
• Rugged Reliability: Engineered for trail and farm duty, designed to withstand shocks, debris, and water exposure typical of utility riding.
• Cost-Effective Upgrade: Avalue-focused aftermarket option that delivers OEM-like performance without OEM pricing.

Installation Notes:

• Support the machine securely and disconnect the battery before beginning any drivetrain work to avoid accidental shorting or movement.
• Drain the existing differential oil, inspect the drain and fill plugs for damage, and replace as needed with the recommended SAE 80W-90 gear oil when reassembling.
• Inspect mounting surfaces, seals, and gearhousing for wear; replace seals if they show signs of leakage or hardening to prevent future leaks.
• Align the differential mounting points with the subframe and connect all supplied linkages and mounting hardware to factory specifications.
• Follow the vehicle service manual for torque values on rear-diff bolts and flange connections; overtightening or under-tightening can cause leaks or misalignment.
• After installation, refill and re-check the differential oil to ensure proper level and inspect for leaks during the first post-install test ride.

Why Upgrade?

Running a worn-out rear differential on these Honda platforms risks uneven power delivery, further gear damage, and unpredictable traction in challenging conditions. Replacing with this aftermarket rear-diff assembly restores reliable torque transfer and reduces the risk of drivetrain failure, keeping you productive on the trail or farm.