Delphi TC4390 front right lower control arm with ball joint for the 2021-2025 BMW M440i and other vehicles connects the wheel assembly to the chassis and pivots through its ball joint. As a control arm and ball joint assembly, it comes with the joint already attached, so the two are replaced as one piece.
- Withstands temperatures below -40 degrees C and over 120 degrees C and 720 hours of salt spray
- 100% crack detection and ultrasonic flaw detection on every control arm
- Ball studs machined to micron tolerances for smooth joint operation
- Robot-welded arm for consistent quality
- Anti-corrosion protection applied to each part
Quick facts
- Part: Delphi TC4390 control arm with ball joint
- Also called: control arm and ball joint assembly
- Fits: 2021-2025 BMW M440i and other vehicles
- Position: Front right lower rearward
- Condition: New
A clunk over bumps, loose or wandering steering, or uneven front tire wear can mean a worn lower arm or ball joint. These signs alone do not prove this arm is the problem, since a worn sway bar link can make a similar clunk. This listing is one arm for the front right, with one arm on each side of the front axle. The front left is a separate part, and both sides are normally replaced together.
Fits
This control arm with ball joint fits the 2021-2025 BMW M440i, the 2021-2025 BMW M440i xDrive and the 2022-2025 BMW M440i Gran Coupe, among many other vehicles.
Specifications
Fit and size
- Position: front right lower rearward
- Quantity per application: 1
- Sold individually (one per listing)
Build and materials
- Construction: control arm with ball joint, robot-welded
- Anti-corrosion protection on each part
- Condition: New
- Country of origin: Turkey
Interchange: 31 10 6 878 594 · 31 10 6 888 856 · 31 10 6 898 072
1028376 · KSC4463 · CMS101649 · X05CJ1126
This part cross-references / interchanges with the following part numbers:
31 10 6 878 594, 31 10 6 888 856, 31 10 6 898 072, 1028376, KSC4463, CMS101649, X05CJ1126
Frequently Asked Questions
Does the Delphi TC4390 fit a 2021-2025 BMW M440i xDrive?
Yes. The Delphi TC4390 front right lower control arm fits the 2021-2025 BMW M440i xDrive. If your car is not named on this page, look it up in the "Vehicles it fits" section.
Is the Delphi TC4390 a left or right side control arm?
The Delphi TC4390 is for the front right, in the lower rearward position. The front left side takes its own separate arm.
Does this front lower control arm come with the ball joint attached?
Yes. The ball joint is part of this arm, so the arm and joint arrive as one piece and are replaced together.
How are Delphi control arms like the TC4390 checked during manufacturing?
Each arm gets 100% crack detection and ultrasonic flaw detection, and the arms are robot-welded. The ball studs are machined to micron tolerances.
Does the Delphi TC4390 replace part number 31 10 6 878 594?
Yes. 31 10 6 878 594 is one of the numbers this Delphi TC4390 replaces. The other cross-reference numbers are on the Interchange line.
