Honda TRX300 Fourtrax Rear Differential + Axle + Hub Kit (1988–2000): Keep the Immortal Quad Alive

The Quad That Refuses to Die

Honda built the TRX300 Fourtrax from 1988 to 2000, and it earned a reputation most machines never touch: the ranch quad that simply will not quit. Thirty-plus years later, Fourtrax 300s are still dragging feeders across Texas pastures, plowing snow in Michigan, and hauling firewood in every state in between. Owners joke that you don't own a Fourtrax, you inherit one. But even the immortal quad has one mortal spot — after three decades of mud, cattle guards, and "it's fine, send it," the rear end's bearings, splines, and hubs eventually cry uncle.

Honda's utility quads: decades old, still on the payroll (photo: Wikimedia Commons)

Everything the Rear End Needs, in One Box

This HQPASFY rear differential + axle shaft + wheel hub kit is the whole cure in one order: a complete rear differential assembly, the rear axle shaft, and both wheel hubs with hardware, castle nuts, and cotter pins. It replaces OEM part numbers 41300-HM5-A10, 41300-HC4-000, and 41300-HC5-970, and fits the 1988–2000 TRX300 (2×4) and TRX300FW (4×4).

The fitment card: OEM cross-reference and the 1988–2000 TRX300/TRX300FW coverage

• Complete kit — diff assembly + axle + hubs, so you're not chasing worn parts one at a time
• Direct OEM cross-reference — check your part number against the list above
• $197.99 all-in — a used OEM differential alone often costs more, with 30 years of unknown abuse included free

The Honest Wrench Talk

If your Fourtrax howls under load, clunks on takeoff, or wobbles a rear wheel on worn splines, piecing the rear end back together with junkyard parts is a gamble stacked on a gamble. A complete new kit means every wear surface starts at zero — and the quad that's been in the family since the first Bush administration keeps earning its keep.

From Our Warehouse to Your Shop Stand

AZ Sun Valley Sales is a family-run liquidation reseller in Mesa, Arizona. Inspected and photographed by us, ships within 1 business day, free shipping over $100, 30-day returns.