Complete Guide to 2017-2019 Honda Fourtrax Foreman 500 Rear Differential Final Gear Replacement
2026 Maintenance Update: As the 2017-2019 Honda Foreman models reach their 7-9 year service milestone, drivetrain wear—specifically in the final gear assembly—becomes a primary maintenance concern for high-utilization ATVs.
Professional Guide: Honda Fourtrax Foreman 500 (2017-2019) Rear Differential Replacement
The rear differential final gear is the critical mechanical junction where torque is translated from the driveshaft to the rear axles. In the Honda Foreman 500 (TRX500) platform, this assembly must handle extreme shock loads during towing and trail riding. Replacing a worn final gear isn't just about restoring movement; it's about preserving the integrity of your entire drivetrain.
Featured Precision Drivetrain Part
Engineered to exact OEM tolerances, our Fits 2017-2019 Honda Fourtrax Foreman 500 Rear Differential FINAL GEAR serves as a direct-fit replacement for Honda part 41300-HR3-W50. This unit features reinforced gear teeth to resist pitting under heavy-duty farm and utility use.
View Technical Details & CompatibilityTechnical Specifications & Compatibility
| Metric | Specification |
|---|---|
| Model Fitment | Honda Fourtrax Foreman 500 / Rancher 420 (2017-2019) |
| OEM Part Number | 41300-HR3-W50 |
| Gear Composition | Heat-Treated Steel Alloy for High Impact Resistance |
| Lubrication Req. | SAE 80 Hypoid Gear Oil (Recommended) |
Early Diagnostic: Signs of Final Gear Failure
Differential failure rarely happens instantly. Recognizing these symptoms early can save you from a complete axle lock-up on the trail:
- High-Pitched Gear Whine: Often caused by improper gear meshing or worn pinion bearings.
- Metal Shavings in Oil: During a fluid change, look for "glitter" or metallic flakes, indicating gear tooth pitting.
- Backlash Clunk: A noticeable "clunk" when shifting from Neutral to Drive or Reverse, suggesting excessive play between the ring and pinion.
- Leaking Pinion Seal: Differential fluid on the rear of the case often leads to low lubrication and eventual gear burning.
Installation Best Practices
Replacing the final gear requires mechanical precision. To ensure the 1-year warranty coverage remains valid, follow these industry-standard steps:
- Thorough Case Cleaning: Ensure the differential housing is completely free of old metal fragments and sludge before installing the new gear.
- Check Axle Splines: Inspect the rear axle splines for wear. A new differential paired with worn axle splines will cause premature failure.
- Seal Replacement: Always use new O-rings and dust seals during reassembly to prevent water intrusion.
- Break-In Period: For the first 5-10 hours of operation, avoid extreme towing to allow the gear teeth to "mate" correctly.
Technical FAQ
Does this fit the IRS (Independent Rear Suspension) models?
No. This specific final gear is designed for the Solid Rear Axle (SRA) configurations of the 2017-2019 Foreman 500 and Rancher 420. IRS models utilize a different differential layout.
What kind of oil should I use for reassembly?
We recommend a high-quality SAE 80 Hypoid Gear Oil. Avoid using standard motor oil, as it lacks the extreme-pressure additives required to protect hypoid gear sets under load.
Is the ring and pinion pre-aligned?
This assembly is a precision-machined component. While designed for direct fitment, we always recommend verifying the gear mesh pattern during installation to account for any wear in your existing differential housing.
Restore Your ATV's Drivetrain Reliability
Don't let a grinding rear end stop your workday. Our OEM-quality final gear ensures your Honda Foreman is ready for the toughest terrain.
Shop Final Gear AssemblyPrecision Machined | Heavy-Duty Construction | 1-Year Warranty