Rear differential complete assembly designed for Honda Rancher models, specifically TRX350 from 2000–2006 and TRX400FA from 2005–2007. This aftermarket replacement restores the full 4x4 drivetrain performance by replacing worn gear teeth, bearings, and seals, eliminating slop and restoring smooth, confident engagement on trails or farms. It’s a bolt‑in unit that mirrors the factory interface, ready to bolt in, fill with oil, and get you back in the saddle quickly.

Built to tackle muddy, rocky, and load-heavy conditions, this rear diff solves the common failures of a worn final drive: gear lash, increased play, oil leaks, and degraded four-wheel-drive performance. By replacing the entire differential center with a durable, machined unit, you regain predictable torque transfer and long‑term reliability for the trail or farm work. This aftermarket replacement is designed to deliver the same fit, function, and longevity you expect on demanding applications.

Comprehensive Vehicle Fitment

Notes: Compatibility inferred from OEM references for 41300-HN5-671 and related TRX350/TRX400 models; verify against your exact VIN and model details prior to installation.

Product Specifications

OEM & Aftermarket Cross-Reference Information

What’s Included

This kit includes the following component in the box:

• Rear differential assembly (with all internal bearings, seals & gears)

Note: Oil and any external seals or gaskets not already installed in the core unit may need to be replenished during installation.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility – engineered to bolt into Honda TRX350 (2000-2006) and TRX400FA (2005-2007) chassis without modifications.
• OEM Cross-Reference – aligns with the factory part reference 41300-HN5-671, ensuring reliable interchangeability.
• Premium Materials – built with durable gears and a sturdy housing designed for heavy-duty trail and farm use.
• Performance Restoration – restores 4x4 engagement, torque transfer, and driveline feel that’s typical of a fresh differential.
• Cost-Effective Maintenance – lower replacement cost than OEM while delivering similar fit and function for off-road use.
• Long-Term Reliability – designed to withstand repeated mud, rock, and load cycles common to ATV work and recreation.

Installation Notes:

• Secure the ATV on stands and remove the rear wheel(s) to access the differential housing safely.
• Drain the differential oil before disconnecting the old unit to minimize spills; use a drain pan and replace the drain plug if needed.
• Carefully detach the drive axles and any mounting brackets, then remove the old differential center, inspecting seals and bearings for wear.
• Clean the mounting surfaces thoroughly; install the new Rear Differential Assembly and verify proper spline engagement before tightening fasteners.
• Fill with the recommended gear oil to the manufacturer’s specification and reseal the housing; check for leaks after initial operation.
• Reconnect axle shafts, torque fasteners to OEM specs, and perform a cautious 4x4 engagement test on level ground before returning to full duty.

Why Upgrade?

Running a worn or failing rear differential can lead to uneven power delivery, grinding or clunking noises, and eventual driveline failure. Replacing with this aftermarket complete diff restores reliable four-wheel-drive engagement and drivability, reducing the risk of further transmission damage and giving you dependable performance again on both trails and work rides.