The 2021 BMW 840I has 35 suspension parts with verified fitment on this page — 5 part types and 11 brands, covering the 3.0L L6 Turbocharged engine. Each part includes a manufacturer part number and application notes.
On the 2021 BMW 840I, the suspension system controls ride, tire contact and alignment through shocks, struts, control arms, bushings and links. 31 parts of the 35 listed are Sway Bar Link (16 parts), Control Arm (11 parts) and Ball Joint (4 parts). The other 2 part types cover the remaining 4 parts.
Every part on this page is matched to the 3.0L L6 Turbocharged — the only engine offered in the 2021 BMW 840I.
The most listed brands for 2021 BMW 840I suspension parts are DELPHI (10 parts), DORMAN (6 parts) and MEVOTECH (6 parts), plus 8 more brands. Quality grades include Daily Driver and Economy.
7 parts on this 2021 BMW 840I page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including DELPHI TC4617 (Control Arm) and DELPHI TC6984 (Sway Bar Link). Click any part number to see every vehicle that part fits.
Ball Joint
Daily Driver
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 538378 | 🇺🇸 US | Front Lower840i xDrive Base Model or 840i xDrive Gran Coupe | View on Amazon |
| MEVOTECH | MS10597 | 🇺🇸 US | Supreme | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY | 1018629 | 🇺🇸 US | Front Lower Rearward840i xDrive Base Model or 840i xDrive Gran Coupe | View on Amazon |
| MEVOTECH | GS10597 | 🇺🇸 US | Original Grade | View on Amazon |
This table covers the ball joints that articulate each control arm at the knuckle.
4 Ball Joint parts for the 2021 BMW 840I come from 3 brands — MEVOTECH, DORMAN and BECK/ARNLEY.
In the Daily Driver grade, DORMAN and MEVOTECH supply 2 parts: grouped for everyday commuting duty. A representative part number is DORMAN 538378.
The Economy section lists 2 options from BECK/ARNLEY and MEVOTECH — the catalog's value-priced group. BECK/ARNLEY 1018629 is listed in this group.
Listed part numbers: DORMAN 538378, MEVOTECH MS10597 and BECK/ARNLEY 1018629, plus the other parts above.
Control Arm
Daily Driver
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DELPHI Popular | TC4617 | 🇺🇸 US | Rear Left Lower RearwardLateral Arm | View on Amazon |
| DELPHI Popular | TC4538 | 🇺🇸 US | Rear Left Upper ForwardLateral Arm | View on Amazon |
| DELPHI | TC4618 | 🇺🇸 US | Rear Right Lower RearwardLateral Arm | View on Amazon |
| DELPHI | TC4405 | 🇺🇸 US | Rear Left Upper Rearward | View on Amazon |
| DELPHI | TC4539 | 🇺🇸 US | Rear Right Upper ForwardLateral Arm | View on Amazon |
| DELPHI | TC4404 | 🇺🇸 US | Rear Right Upper Rearward | View on Amazon |
| DELPHI | TC4536 | 🇺🇸 US | Complete Arm with Ball JointAdjustable | View on Amazon |
| DELPHI | TC4537 | 🇺🇸 US | Complete Arm with Ball JointAdjustable | View on Amazon |
| DORMAN | 520831 | 🇺🇸 US | Rear Left Upper ForwardLateral Arm | View on Amazon |
| DORMAN | 520832 | 🇺🇸 US | Rear Right Upper ForwardLateral Arm | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ÜRO PARTS Popular | 33326875104 | 🇺🇸 US | Fits Rear Right Lower Rearward | View on Amazon |
This table covers the control arms that locate each hub relative to the chassis. Typical signs include clunks over bumps, a wander on the highway, or inner-edge tire wear. Get an alignment after any control-arm work, and inspect the ball joint and bushings that came with the arm.
11 Control Arm parts for the 2021 BMW 840I come from 3 brands — DELPHI, DORMAN and ÜRO PARTS. The "Popular" part is DELPHI TC4617.
Daily Driver: 10 parts, from DELPHI and DORMAN. A representative part number is DELPHI TC4617.
The Economy section: 1 option from ÜRO PARTS. ÜRO PARTS 33326875104 is listed in this group.
Control Arm Nut
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | HWN0119 | 🇺🇸 US | Fits Front Lower Outer Forward840i xDrive Base Model or 840i xDrive Gran Coupe | View on Amazon |
This table covers the Control Arm nuts.
One part is listed for the 2021 BMW 840I — REIN HWN0119.
Ride Height Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARNOTT | RH3718 | 🇺🇸 US | Fits Rear | View on Amazon |
| FCS | HS008 | 🇺🇸 US | Fits Rear | View on Amazon |
| MONROE | HS10203 | 🇺🇸 US | Fits Frontwith Air Suspension | View on Amazon |
This table covers the Ride Height sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
3 Ride Height Sensor parts for the 2021 BMW 840I come from 3 brands — ARNOTT, FCS and MONROE.
Part numbers include ARNOTT RH3718, FCS HS008 and MONROE HS10203.
Sway Bar Link
Daily Driver
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DELPHI Popular | TC6984 | 🇺🇸 US | Front840i xDrive Base Model or 840i xDrive Gran Coupe | View on Amazon |
| MEVOTECH Popular | MS108262 | 🇺🇸 US | SupremeIncludes Hardware | View on Amazon |
| SUSPENSIA Popular | X05SL0180 | 🇺🇸 US | RearCoupe or Sedan | View on Amazon |
| SUSPENSIA Popular | X05SL0072 | 🇺🇸 US | Front840i Base Model | View on Amazon |
| DELPHI | TC6916 | 🇺🇸 US | Front840i Base Model | View on Amazon |
| DORMAN | 541813 | 🇺🇸 US | Front840i xDrive Base Model or 840i xDrive Gran Coupe | View on Amazon |
| DORMAN | 541836 | 🇺🇸 US | Rear | View on Amazon |
| DORMAN | 541815 | 🇺🇸 US | Front840i Base Model or 840i Gran Coupe | View on Amazon |
| MEVOTECH | MS108256 | 🇺🇸 US | SupremeIncludes Hardware | View on Amazon |
| MEVOTECH | MS108257 | 🇺🇸 US | Supreme | View on Amazon |
| MOOG | K751103 | 🇺🇸 US | Fits Rear840i Base Model or 840i xDrive Base Model | View on Amazon |
| SUSPENSIA | X05SL0808 | 🇺🇸 US | Steel | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY | 1018631 | 🇺🇸 US | RearEnd Link | View on Amazon |
| BECK/ARNLEY | 1018630 | 🇺🇸 US | Front840i xDrive Base Model or 840i xDrive Gran Coupe | View on Amazon |
| BECK/ARNLEY | 1018404 | 🇺🇸 US | Front840i Base Model or 840i Gran Coupe | View on Amazon |
| MEVOTECH | GS108256 | 🇺🇸 US | Original Grade | View on Amazon |
This table covers the links that connect the anti-roll bar to each control arm or strut. Typical signs include a clunk on one wheel over a driveway, or a rattle that goes away when you lean on the bar. Replace links in pairs; a seized stud often takes the bushing with it.
16 Sway Bar Link parts for the 2021 BMW 840I come from 6 brands — MEVOTECH, SUSPENSIA, DORMAN and 3 other brands. The "Popular" part is DELPHI TC6984.
Daily Driver: 12 parts, from MEVOTECH, SUSPENSIA, DORMAN and 2 other brands. A representative part number is DELPHI TC6984.
The Economy section: 4 options from BECK/ARNLEY and MEVOTECH. BECK/ARNLEY 1018631 is listed in this group.
Buying Suspension Parts for a 2021 BMW 840I
On this vehicle, the suspension system controls ride, tire contact and alignment through shocks, struts, control arms, bushings and links.
- Confirm you have the 3.0L L6 Turbocharged engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace shocks and struts in axle pairs, renew the sway-bar links with the struts, and get an alignment after any control-arm or tie-rod work.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Sway Bar Link and Control Arm .
Frequently Asked Questions
How many suspension parts fit the 2021 BMW 840I?
Our catalog currently lists 35 suspension parts for the 2021 BMW 840I across 5 subcategories and 11 brands, covering the 3.0L L6 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of suspension problems on a 2021 BMW 840I?
Common symptoms include clunks over speed bumps, wandering steering, cupped tire wear, or a nose that keeps bouncing after a dip. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace shocks and struts in axle pairs, renew the sway-bar links with the struts, and get an alignment after any control-arm or tie-rod work.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 BMW 840I was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 BMW 840I?
Every part on this page is matched to the 3.0L L6 Turbocharged engine. Then worn bushings often mimic bad shocks — inspect before buying, and remember loaded vs unloaded strut assemblies differ in labor by hours. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 BMW 840I
Suspension Parts for Other BMW 840I Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.