Rear Differential Ring Gear for Honda TRX 420 TM TE FM FE 2007-2013 OEM Replacement

Rear Differential Ring Gear for Honda TRX 420 models from 2007 through 2013 is the precision final-drive component that transfers engine torque to the wheels via the differential. This aftermarket replacement preserves OEM-style geometry and tooth profile, restoring quiet operation and reliable torque transfer on demanding trail and farm workloads. Replacing a worn ring gear helps prevent tooth chipping, excessive backlash, and differential noise that can lead to more costly failures if left unaddressed.

Designed specifically for the Honda TRX 420 TM/TE/FM/FE platform, this aftermarket ring gear delivers direct-fit compatibility and consistent performance, pairing with the existing final-drive components to maintain correct gear engagement under load. It’s a practical choice for riders who regularly push through rough terrain or work duties where reliability matters most, offering long-lasting durability without the premium OEM price.

Comprehensive Vehicle Fitment

Fitment data pulled from dealer listings showing TRX 420 TM/TE/FM/FE 2007–2013.

Product Specifications

OEM & Aftermarket Cross-Reference Information

Cross-reference notes and OEM equivalents are drawn from multiple suppliers that list TRX 420 ring gears within the TRX 400/420/450/500 family, including OEM-numbered references and aftermarket replacements.

What's Included

This kit includes the following component in the box:

• Rear Differential Ring Gear

Note: Related components such as bearings, seals, or the pinion are sold separately unless specifically included in a multi-part kit.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Engineered to match OEM geometry and tooth profile for a seamless install on TRX 420 TM/TE/FM/FE models.
• OEM Cross-Reference: Aligns with Honda OEM lineage while offering a cost-conscious alternative for maintenance cycles.
• Premium Materials: Constructed from hardened alloy steel designed to withstand off-road torque and debris ingestion.
• Performance Restoration: Restores original final-drive performance, reducing noise and improving torque transmission under load.
• Durability & Longevity: Hardened finish and robust construction resist wear in rugged trail or farm conditions.
• Value-Driven Choice: High-quality aftermarket part that delivers reliable service without OEM price premium.

Installation Notes:

• Preparation: Drain differential oil and clean the housing surfaces before installation to prevent contamination.
• Cleanliness & Alignment: Inspect mating surfaces for burrs or damage; ensure ring gear aligns precisely with the carrier bore and bolt holes.
• Fasteners & Threadlocker: Use fresh fasteners if supplied; apply appropriate threadlocker per service manual recommendations and torque to spec.
• Torque & Pattern: Follow the factory service manual for the correct torque specification and bolt tightening sequence; avoid over-torquing and misalignment.
• Backlash & Runout: After installation, verify gear backlash and runout per the service manual; incorrect backlash can lead to noise or premature wear.
• Lubrication & Oil Change: Refill with fresh differential oil after installation and inspect for leaks; dispose of old oil properly.

Why Upgrade?

Worn or damaged ring gears can cause tooth chipping, abnormal gear noise, and degraded power transfer, especially under heavy load on rough terrain. Upgrading to this aftermarket ring gear restores proper engagement, strengthens the final-drive assembly, and helps prevent unexpected breakdowns during work or adventure.