Rear Differential Ring Gear For Honda TRX 400 FW 95-01,TRX 420 14-21,TRX 450 98-04,TRX 500 FM 05-18,TRX 520 FM 20-21

Rear Differential Ring Gear for Honda TRX 400 FW, TRX 420 SRA, TRX 450 Foreman, TRX 500 Foreman, and TRX 520 Foreman. This precision-engineered gear is the heart of the final-drive, converting engine torque into wheel motion through the ring and pinion interaction. Replacing a worn or damaged ring gear restores proper gear mesh, minimizes lash, and helps prevent costly drivetrain failure in rugged trail or farm conditions. Built to match Honda’s drivetrain geometry, it provides reliable, long-lasting performance when you need it most.

This aftermarket replacement is engineered to mirror OEM specifications, delivering durable, dependable performance in mud, gravel, and heavy-use scenarios. It’s a practical, cost-conscious choice for riders and operators who demand consistent final-drive reliability without the premium OEM price, with a design focused on quiet operation and extended service life on demanding UTV and quad routes.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

What’s Included

What’s included in the box:

• Rear differential ring gear

Related components such as bearings, seals, and gasket sets are sold separately.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Carefully engineered to match Honda final-drive geometry for seamless installation on listed TRX models.
• OEM Cross-Reference: Replaces Honda OEM numbers 41431-HP0-A00 and 41431-HN2-000 with reliable aftermarket equivalents.
• Premium Materials: Built from high-strength alloy steel to stand up to torque loads and rugged conditions.
• Heat-Treated for Durability: Quenched and tempered to resist wear and provide long service life in harsh environments.
• Performance Restoration: Restores proper gear mesh to reduce backlash and prevent differential damage during hard use.
• Trail- and Farm-Ready: Designed for reliable operation under continuous back-road and field duties with broad model coverage.

Installation Notes:

• Preparation: Drain differential oil and remove the differential cover to access the ring gear and pinion mesh.
• Inspection: Carefully inspect the ring gear and pinion for wear, pitting, or chipped teeth; replace any damaged components to avoid uneven mesh.
• Backlash & Mesh: Verify proper backlash and gear mesh; verify alignment with reference marks or OEM service manual procedures.
• Hardware: Use high-strength fasteners if replacing bolts; replace any worn bolts with new hardware as recommended by the service manual.
• Lubrication & Seals: Refill with the correct differential oil grade and inspect seals; replace seals if they show signs of leakage.
• Reassembly: Reassemble in the correct order, torque fasteners to OEM specifications, and reinstall the differential cover with new gasket/seal material as required.

Why Upgrade?

Running a worn ring gear invites uneven wear, increased lash, and the risk of sudden drivetrain failure under load. This aftermarket replacement restores reliable torque transmission and driveshaft harmony, returning your Honda TRX’s final-drive performance to like-new condition for confident trail or farm work. By renewing the ring gear, you reduce the chance of tooth breakage and extend the life of the entire differential assembly.