RALBDX Rear Final Gear Differential for Honda Rancher 420 (2007-2013) — Direct-Fit Full Assembly, OE Replacement

High-strength rear final gear differential engineered to replace worn units on Honda Fourtrax Rancher 420 models from 2007–2013.

The RALBDX Rear Final Gear Differential is a direct-fit replacement assembly built to restore rear drive performance on Honda Rancher 420 ATVs. Designed to match OE fitment and mounting points for TRX420FE/FM/FPE/FPM/TE/TM model years 2007 through 2013, the unit arrives as a complete rear differential assembly so you can swap it in without sourcing additional core parts. It’s intended for users who need a durable replacement after gear wear, fluid leaks, or handling symptoms tied to a failing differential.

How do I know this differential fits my Rancher 420?

Compatibility is specified for common Rancher 420 variants from 2007–2013. Confirm your model code (TRX420FE, TRX420FM, TRX420FPE, TRX420FPM, TRX420TE, TRX420TM) and compare the part numbers before ordering.

• Replaces OEM part numbers 41300-HP5-600 and 41300HP5600
• Fits rear-side final gear applications on listed TRX420 model codes
• Supplied as a full rear differential assembly for direct replacement

What signs indicate my rear differential needs replacement?

Several mechanical symptoms point to a failing or damaged differential. If you hear unusual noises, detect fluid leaks, or experience handling problems, the differential should be inspected and possibly replaced.

• Whining, grinding, or growling noises from the rear under load
• Visible differential fluid leaks around the housing or axle seals
• Tire wear, vibrations during acceleration, or poor turning behavior

What should I know about installation and break-in?

Proper installation and initial operation matter for longevity. Follow standard gear oil filling procedures and have a professional set pinion and ring clearances if required to avoid dry running, excessive noise, or overheating.

• Install using correct torque specs and gasket/seal replacements
• Fill with the correct grade and amount of gear lubricant as specified
• Drive normally through the break-in period; avoid heavy loads initially

How should I maintain this differential to prevent future problems?

Routine fluid service and periodic inspections keep the assembly functioning longer. Gear lube condition and level are primary factors; schedule checks and changes according to use and mileage.

• Change gear lubricant every 20,000–40,000 miles depending on conditions
• Inspect seals and mounting hardware during regular service intervals
• Address noises or leaks promptly to avoid secondary damage to axles or tires

Who is this for: The RALBDX Rear Final Gear Differential is aimed at Rancher 420 owners, ATV mechanics, and fleet managers who need a reliable, direct-fit rear differential assembly for 2007–2013 Honda Fourtrax models. It suits riders replacing a failed unit, prepping a machine for resale, or restoring an ATV used in heavy-duty applications where a factory-style replacement is required. Always have installation verified by a qualified technician and follow recommended oil and service intervals for best results.