Restore precise steering and quiet the front suspension with the Beck/Arnley Suspension Control Arm and Ball Joint Assembly (P/N 102-7724). This front left lower rearward unit combines the control arm and a pre-attached ball joint into one assembly, giving you a direct replacement built with special attention to OE form, fit, and function. It drops in as an application-specific fit for a wide range of BMW xDrive models, including the 2017-2021 BMW 230i xDrive, 2013-2018 BMW 320i xDrive, 2014-2018 BMW 328d xDrive, 2013-2016 BMW 328i xDrive, 2016-2018 BMW 340i xDrive, 2017-2020 BMW 440i xDrive, and 2017-2021 BMW M240i xDrive — see the "Vehicles it fits" section for the full 21-application list and engine details.
- Complete assembly: the control arm comes with the ball joint already installed for a complete installation.
- Durable construction: steel, iron, or aluminum construction for durability and rust/corrosion resistance.
- OE match: engineered to match OE form, fit, and function for the listed applications.
- Hardware: new hardware and bushings are included where applicable.
Worn control arm bushings or a failing ball joint can show up as clunking over acceleration or braking, uneven tire wear, or loose, wandering steering. If a worn front left lower rearward arm or its ball joint is the cause, this assembly replaces it.
Interchange: 31126854727 · RK623486 · CMS101309
This part cross-references / interchanges with the following part numbers:
31126854727, RK623486, CMS101309
Frequently Asked Questions
What position is this control arm for?
It is cataloged as the front left lower rearward control arm and ball joint assembly for the listed BMW applications.
Does it include the ball joint?
Yes. The control arm comes with the ball joint already attached for a complete installation.
What is the assembly made of?
The manufacturer lists steel, iron, or aluminum construction for durability and rust and corrosion resistance, depending on the application.
Does it come with hardware and bushings?
New hardware and bushings are included where applicable. Consult the vehicle service information for the correct fasteners and whether any may be reused.
How do I know it fits my BMW?
It is an application-specific fit for 21 BMW xDrive models. Check the "Vehicles it fits" section to confirm your exact year, model, and engine before ordering.
