ARB UCA Ball Joint Kit - Single - UCASP002

The ARB UCA Ball Joint Kit – Single (Part No. UCASP002) is a genuine ARB replacement ball joint kit designed specifically to service ARB's own upper control arms. If you're running ARB upper control arms on your off-road build and need to replace or refresh a worn ball joint, this is the purpose-built service kit to get the job done right — without swapping out the entire control arm assembly. Priced at $119.95 and sold as a single kit, it's the straightforward way to restore the precision and integrity of your ARB UCA suspension setup.

Key Features & Benefits

• Direct ARB Compatibility: Engineered specifically to suit ARB upper control arms UCA001 and UCA004, so you get a confirmed fit within the ARB suspension ecosystem — no guesswork on compatibility.
• Includes Boot: The kit comes complete with a protective boot, which shields the ball joint grease and internals from dirt, mud, and moisture — critical for off-road vehicles that see harsh terrain regularly.
• Sold as a Single Kit: Lets you replace one ball joint at a time, making it a cost-effective solution when only one side needs servicing rather than forcing you to buy a full pair.
• Genuine ARB Part: Sourced directly from ARB, so construction and tolerances are matched to the original UCA design — important for maintaining proper suspension geometry and steering feel after installation.
• Restore Suspension Integrity: A worn or failed upper control arm ball joint can cause vague steering, uneven tire wear, and unsafe handling. Replacing it with this kit returns your suspension to proper operating condition.

Specifications

• Brand: ARB
• Part Number (MPN): UCASP002
• SKU: ARBUCASP002
• UPC: 9332018078094
• Product Type: Suspension Arm Ball Joint Service Kit
• Quantity: Single (1 kit)
• Includes Boot: Yes
• Price: $119.95

Fitment

The ARB UCASP002 ball joint kit is designed to suit ARB upper control arms UCA001 and UCA004. This is a service/replacement part for those specific ARB UCA assemblies — it is not a universal ball joint and is not intended for use with OEM control arms or third-party aftermarket control arm brands. If you are unsure whether your ARB upper control arms are the UCA001 or UCA004 variant, check the part number on your existing ARB UCAs or contact our fitment team before ordering. Vehicle fitment is ultimately determined by which ARB upper control arm your truck or SUV is equipped with.

What's in the Box

• 1x ARB UCA Ball Joint (single)
• 1x Protective Boot

Why Buy from ThreePiece.us

At ThreePiece.us, we back every order with free shipping, so the $119.95 price you see is the price you pay — no surprise freight charges at checkout. Not ready to pay all at once? We offer financing through Affirm, letting you split your purchase into manageable payments. Our expert fitment support team is here to help you confirm that the UCASP002 is the right service kit for your specific ARB upper control arms before you order — just reach out and we'll verify compatibility. With over 10,000 customers served and a decade of experience in performance and suspension parts, we're a resource you can rely on for accurate product guidance and a smooth buying experience.

Frequently Asked Questions

Q: Which ARB upper control arms does the UCASP002 ball joint kit fit?
A: The UCASP002 is designed to suit ARB upper control arms with part numbers UCA001 and UCA004. It is a purpose-built service part for those two specific ARB UCA assemblies.

Q: Does this kit include a boot?
A: Yes. The ARB UCASP002 kit includes the ball joint and a protective boot, so you have everything needed to complete a proper installation and protect the joint from contamination.

Q: Is this kit sold as a single or a pair?
A: This listing is for a single ball joint kit. If you need to service both sides of your vehicle, you will need to order two kits.

Q: Will this ball joint work with OEM or other aftermarket upper control arms?
A: No — the UCASP002 is specifically engineered for ARB's UCA001 and UCA004 upper control arms. It is not a universal fit and is not designed for OEM or non-ARB control arm assemblies. If you're unsure about compatibility, contact our fitment team before placing your order.