Help keep your heavy-duty truck's front suspension tight and properly aligned with the MOOG control arm with ball joint RK623896, a front upper unit engineered for structural strength and corrosion protection. It installs as a direct-fit replacement for the 2020-2023 Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD and GMC Sierra 3500 HD. See the "Vehicles it fits" section for engine-specific details.
This MOOG upper control arm links the steering knuckle to the frame. It lets the wheel travel up and down, and the ball joint provides the steering pivot. Because it comes as a pre-assembled control arm and ball joint assembly, it replaces the arm, joint and bushings in one piece.
- Hardened studs: The studs are induction hardened to maximize strength, resist breakage and improve fatigue life.
- Greaseable socket with dust boot seal: You can add fresh lubricant to flush out contaminants, which makes maintenance easy and helps reduce corrosion and wear. A pre-installed dust boot seal acts as a barrier against dirt, water and other wear-causing contaminants.
- Premium bushings: The bushings come pre-installed, with stiffness optimized to inhibit noise for a comfortable ride.
- Hardware included: The arm ships with the hardware needed for installation. Precision tolerances are designed for easy installation and steering alignment.
A laser-etched ID gives visible assurance of genuine MOOG quality. Signs that a front upper control arm or ball joint may need replacing include clunking over bumps, loose or wandering steering, uneven tire wear, or a torn ball joint boot.
Interchange: 521-678
84682566 · 84735902 · 8CB503335 · 521678
This part cross-references / interchanges with the following part numbers:
521-678, 84682566, 84735902, 8CB503335
Frequently Asked Questions
Which trucks does RK623896 fit?
It fits the 2020-2023 Chevrolet Silverado 2500 HD and 3500 HD and the 2020-2023 GMC Sierra 2500 HD and 3500 HD in the front upper position. See the "Vehicles it fits" section for engine details.
Is a MOOG control arm bushing already installed in this arm?
Yes. The bushings come pre-installed, with stiffness optimized to inhibit noise for a comfortable ride.
Can the ball joint be greased?
Yes. The socket is greaseable, so new lubricant can be added to flush out contaminants, which helps reduce corrosion and wear.
Is mounting hardware included?
Yes. MOOG supplies the hardware needed for installation with the arm, to help make the job easy and fast.
What are signs the upper control arm may need replacing?
Common signs include clunking over bumps, loose or wandering steering, uneven tire wear, or a torn ball joint boot. Diagnose the cause before replacing parts.
