Replace a worn front left lower arm in one step with the Dorman control arm 521-639. It pairs the arm with a pre-installed ball joint and bushings and directly replaces the original assembly on specific vehicle applications. It fits many vehicles, among them the 2005-2006 Chevrolet Uplander, 2002-2007 Buick Rendezvous and 2005-2006 Buick Terraza. See the "Vehicles it fits" section for the full list.
Each Dorman suspension control arm and ball joint assembly goes through an industry-leading evaluation process. That process is intended to give a smooth ride, directional stability and predictable dynamics.
- Direct replacement: Takes the place of the original assembly on specific vehicle applications.
- Pre-installed components: Arrives with the ball joint and bushings already installed, saving time and labor.
- Tested quality: Put through industry-leading testing aimed at a smooth, stable and safe ride.
- Corrosion protection: Additional coatings provide rust and corrosion resistance.
Signs that a lower control arm or its ball joint may need replacing include:
- Clunking over bumps
- Loose or wandering steering
- Uneven tire wear
- Cracked or torn bushings
If the original arm is the cause, this assembly replaces the arm, ball joint and bushings together. It is cataloged for the front left lower position, and replacing both sides together is recommended.
Interchange: 810-96649B · 622.66034 · 10318097-L
81096649B · 62266034 · 10318097L · TC5217 · CA12586 · 10318097 · 10393213 · 10413383 · RK621351 · GS50124 · CMS50124 · CMS501275 · 2606028 · 2608394 · 5CB50070 · 5CB50600 · SK521639 · X56CJ7147 · JTC2650
This part cross-references / interchanges with the following part numbers:
810-96649B, 622.66034, TC5217, CA12586, 10318097, 10393213, 10413383, RK621351, GS50124, CMS50124, CMS501275, 2606028, 2608394, 5CB50070, 5CB50600, SK521639, 10318097-L, X56CJ7147, JTC2650
Frequently Asked Questions
What does a front lower control arm do?
It links the steering knuckle to the chassis. It locates the wheel and lets it move up and down, while the ball joint provides the pivot the knuckle turns on when you steer.
Is the Dorman lower control arm sold with the ball joint installed?
Yes. Part 521-639 arrives with the ball joint and bushings pre-installed, so they don't need to be pressed in separately.
Which position does part 521-639 fit?
It is cataloged for the front left lower position on the listed applications. Replacing both sides together is recommended.
Will this fit my 2005-2006 Chevrolet Uplander?
Yes. It is listed for the 2005-2006 Chevrolet Uplander, 2002-2007 Buick Rendezvous and 2005-2006 Buick Terraza. Check the "Vehicles it fits" section for other vehicles.
What should I know before installing it?
Follow the vehicle's service procedure for the correct fasteners, torque values and whether the original hardware may be reused. A wheel alignment check afterward is recommended.
