Help keep your front suspension located and your steering responsive with the MOOG RK621604 front left lower control arm, a direct-fit replacement for the 2005-2007 Ford Five Hundred, 2005-2007 Ford Freestyle and 2005-2007 Mercury Montego. It arrives with the ball joint already installed, so the arm, bushings and joint go in as one piece. Like every premium MOOG CHASSIS control arm, it is engineered for structural strength and corrosion protection.
- Installation ready: Pre-installed ball joint with a sealed socket for maintenance-free operation.
- Easy to install: Precision tolerances intended for straightforward installation and steering alignment.
- Optimized bushings: Designed for quiet operation and to resist wear, salt, road grime and oils.
- Structural strength: Heat treated to match or exceed OE requirements to help inhibit premature failure, with a ball stud shape designed for fatigue life.
- Corrosion protection: Coated studs and an e-coated arm help inhibit premature deterioration.
A lower control arm links the wheel's steering knuckle to the chassis. It holds the wheel in position while letting it travel with the suspension. Worn bushings or a loose ball joint can show up as clunks over bumps, wandering steering or uneven tire wear. The worn part may be a 2005-2007 Ford Freestyle control arm, or the same front left lower arm on a 2005-2007 Ford Five Hundred or 2005-2007 Mercury Montego. If it is the source of the problem, this unit replaces the arm, bushings and ball joint together. A wheel alignment is recommended after installation. See the "Vehicles it fits" section for engine-level fitment details.
Interchange: 820-668210B · 521-879 · 507-2131
820668210B · 521879 · 5072131 · 45D2521 · CB85373PR · CA500L · 5F9Z3079BA · CB85373 · CB85423 · FA3793 · CMS401112 · CMS40147 · MS401112 · MS40147 · 2606722 · 9CB40149 · JTC2624
This part cross-references / interchanges with the following part numbers:
45D2521, 820-668210B, 521-879, CB85373PR, CA500L, 5F9Z3079BA, CB85373, CB85423, FA3793, CMS401112, CMS40147, MS401112, MS40147, 2606722, 9CB40149, 507-2131, JTC2624
Frequently Asked Questions
Will this lower control arm fit a 2005-2007 Ford Five Hundred?
Yes. RK621604 is listed as the front left lower control arm for the 2005-2007 Ford Five Hundred. Check the "Vehicles it fits" section for the other listed vehicles.
Is this a control arm and ball joint assembly with the ball joint already installed?
Yes. The ball joint comes pre-installed and uses a sealed socket for maintenance-free operation.
What does a lower control arm do?
It connects the wheel's steering knuckle to the chassis through its bushings and ball joint. It holds the wheel in position while letting it move up and down with the suspension.
What are signs this control arm may need replacing?
Clunking over bumps, loose or wandering steering, uneven tire wear, cracked bushings or a loose ball joint can be signs of a worn lower control arm. Inspect the suspension to confirm the cause before replacing it.
Do I need an alignment after installing it?
Yes, a wheel alignment is recommended after replacing a control arm. MOOG builds this arm to precision tolerances intended for easy installation and steering alignment.
