RANSOTO Front Upper & Lower Ball Joint Kit — Honda Rancher/Foreman 2004–2013, 4-Piece Heat-Treated Steel

RANSOTO front upper and lower ball joints are a complete four-piece replacement set engineered to restore steering precision and front suspension reliability on select Honda Rancher and Foreman ATVs.

If your Honda Rancher 350 (TRX350 2004–2006), Rancher 420 (TRX420 2007–2013), or Foreman 500 (TRX500 2005–2011) is showing front-end play, clunking, or uneven tire wear, a worn set of ball joints is often the culprit. This RANSOTO kit replaces the OEM parts 51375-HP5-601, 51355-HP5-601 and related numbers and supplies everything needed to rebuild the front suspension: two upper and two lower ball joints plus installation hardware. Each joint is made from heat-treated steel and fitted with durable chloroprene rubber boots to keep contaminants out in off-road conditions.

How do these ball joints improve handling and ride feel?

Replacing worn ball joints restores the intended pivot geometry between wheel hubs and A-arms, eliminating excessive play that causes wandering, vibration, and poor steering return. New joints deliver tighter steering response and more consistent tire contact with the ground.

• Eliminates front-end clunking and loose steering
• Restores correct wheel alignment and contact patch
• Reduces uneven tire wear and vibration
• Improves steering return and stability at speed

Are these a direct fit for my Honda model and which part numbers do they replace?

This RANSOTO set is built as a precision replacement for the listed Honda models and directly substitutes several OEM numbers. Fitment covers all common sub-model designations, so you can swap them into the A-arms without modification.

• Compatible with TRX350 Rancher 2004–2006, TRX420 Rancher 2007–2013, TRX500 Foreman 2005–2011
• Direct replaces 51375-HP5-601, 51355-HP5-601, 51355-HP5-014, 51375-HP0-A01
• Fits FE, FM, TE, TM, ES and similar sub-models
• No drilling or custom machining required for installation

What materials and protections are used to withstand off-road conditions?

These ball joints combine heavy-duty steel construction with heat-treated studs to resist bending and wear under torque. Each joint uses a chloroprene rubber boot to create a weatherproof seal that keeps out mud, water, and sand, extending service life in harsh environments.

• Heat-treated steel ball studs for strength and durability
• Chloroprene rubber boots that resist cracking and abrasion
• Corrosion-resistant finishes to limit rust in wet conditions
• Factory-style tolerances to preserve steering geometry

What comes in the kit and does it include installation hardware?

This is a full front-end repair kit intended to replace every front ball joint in one service session. Hardware for a safe, secure installation is included so you won’t need to source additional small parts.

• Two front upper ball joints and two front lower ball joints (4 pieces total)
• Castle nuts, cotter pins, and snap rings for each joint
• Ready-to-install units—no extra seals or pins required
• Instructions recommended; professional installation advised if unfamiliar with suspension work

Who is this for? If you own a compatible Honda Rancher or Foreman and are experiencing steering looseness, front-end noise, or uneven tire wear, this RANSOTO kit provides an economical, OE-style replacement route. It's aimed at DIY ATV owners and professional mechanics who want a complete, durable front suspension refresh that meets or exceeds original specifications and includes all necessary hardware for a proper rebuild.