Complete Rear Differential Final Gear Box & Wheel Axle Shaft Kit for Honda FourTrax 300 TRX300 TRX300FW 1988-2000 2WD & 4x4 Replaces 41300-HM5-A10 42310-HC4-000

Brand Name: M MATI

Origin: Mainland China

For ATV Brand/Model: Honda

Special Features: Rear Differential Final Gear Box & Wheel Axle Shaft Kit 

MPN : 

41300-HM5-A10  42310-HC5-970

41300-HC4-000  41300-HC5-970 

41300-HM5-850  41411-HA0-000

90307-HC4-000   90307-HM5-930

90308-HC4-000 90308-HM5-930

90481-HC4-000

Package :

Rear Wheel Axle Shaft x 1
Rear Differential x 1
Pinion Joint Gear x 1
Wheel Nut x 2
Wheel Pin x 2
Axle Nut A x 2
Axle Nut B x 2
Washer, Taper x 2

Warranty : 1 year

Condition:  New

Placement on Vehicle :   Rear Wheel

🛠️ Installation Tips

• Pre-Lubrication: The differential is usually shipped with only a light coating of protective oil. You MUST fill it with high-quality 80W-90 Hypoid Gear Oil before operation. Do not run it dry!

• Spline Care: Apply a generous layer of Molybdenum Grease to the axle splines where they slide into the differential gears. This prevents future corrosion and ensures smooth power transfer.

• Seals Inspection: Your new kit includes pre-installed seals. However, ensure the mating surfaces on your vehicle's axle tubes are clean and free of burrs to avoid damaging these seals during installation.

• Brake Drum Alignment: When sliding the axle through the new differential, ensure the brake drum and backing plate are aligned. The TRX300 has a specific "stacking" order for spacers and seals—refer to your service manual.

• Vent Hose: Don't forget to connect the breather/vent hose to the top of the differential. If the vent is clogged or disconnected, internal pressure will build up and blow out the oil seals.

 

Fit for following  Honda ATV

TRX300 FourTrax 300 2x4 1988-2000

TRX300FW FourTrax 300 4x4 1988-2000

🔍 Troubleshooting Guide

Issue	Possible Cause	Solution
Whining/Grinding Noise	Low gear oil or break-in period.	Check the oil level immediately. New gears may have a very slight "hum" for the first hour, but grinding indicates a critical lack of lubrication.
Oil Leaking from Seals	Improperly seated axle or blocked vent.	Ensure the axle is fully pushed into the differential. Check that the vent tube is clear and not pinched.
4WD/2WD Engagement Issues	Axle splines not fully seated.	If the wheels aren't turning under power, the axle may not be fully engaged with the internal ring gear. Re-verify the snap ring positions.
Hard to Turn by Hand	New gear mesh is tight.	It is normal for a brand-new differential to feel slightly stiffer than a worn-out old unit. It will loosen up after the first few miles of use.
Vibration at Speed	Bent axle or loose mounting bolts.	Ensure the differential is bolted securely to the swingarm. Check that the wheel hubs are torqued to spec on the new axle.