27 Drivetrain parts are listed for the 2021 BMW 840I, in 12 part types, covering the 3.0L L6 Turbocharged engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2021 BMW 840I, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. Most of the listed parts are Differential Seal (4 parts), Drive Shaft Flex Joint (4 parts) and Axle Shaft Seal (3 parts). The other 9 part types cover the remaining 16 parts.
The 2021 BMW 840I came with a single engine, the 3.0L L6 Turbocharged, and every part is verified against it.
10 brands supply drivetrain parts for the 2021 BMW 840I, led by REIN (6 parts), ELRING (5 parts) and TIMKEN (4 parts), plus 7 more brands.
Each part number listed for the 2021 BMW 840I opens a page with every vehicle that part fits.
Axle Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 12021750 | 🇺🇸 US | Rear840i xDrive Gran Coupe | View on Amazon |
| TIMKEN | SL260162 | 🇺🇸 US | FrontAWD | View on Amazon |
| TIMKEN | SL260496 | 🇺🇸 US | Rear | View on Amazon |
This table covers the seals where an axle shaft exits the housing. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
3 Axle Shaft Seal parts are listed for the 2021 BMW 840I, from TIMKEN and AJUSA.
This group includes AJUSA 12021750, TIMKEN SL260162 and TIMKEN SL260496.
CV Joint Boot
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY | 1032804 | 🇺🇸 US | Front Outer840i xDrive Base Model or 840i xDrive Gran Coupe | View on Amazon |
| GKN | 306831 | 🇺🇸 US | OUTER Diameter 1.023 InThermoplastic Elastomer | View on Amazon |
| GKN | 306621 | 🇺🇸 US | OUTER Diameter 1.023 InThermoplastic Elastomer | View on Amazon |
This table covers the boots that keep grease in a CV joint. Typical signs include a split boot, grease flung around the joint, or a click once grit is inside. A boot caught early is a kit. Once the joint has clicked, the joint itself is usually worn.
3 CV Joint Boot parts are listed for the 2021 BMW 840I, from GKN and BECK/ARNLEY.
This group includes BECK/ARNLEY 1032804, GKN 306831 and GKN 306621.
Differential Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 16031150 | 🇺🇸 US | Front840i xDrive Base Model or 840i xDrive Gran Coupe | View on Amazon |
This table covers the gaskets that seal the Differential Cover. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
One part is listed for the 2021 BMW 840I — AJUSA 16031150.
Differential Fill / Drain Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | HWP0065 | 🇺🇸 US | Fits Rear DifferentialM22X1.5, Steel | View on Amazon |
| REIN | HWU0065 | 🇺🇸 US | Fits Rear DifferentialM22X1.5, Aluminum | View on Amazon |
This table covers the Differential Fill drain plugs.
REIN supplies both parts for the 2021 BMW 840I.
This group includes REIN HWP0065 and REIN HWU0065.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 12015650 | 🇺🇸 US | Front840i xDrive Base Model or 840i xDrive Gran Coupe | View on Amazon |
| TIMKEN | SL260487 | 🇺🇸 US | Front840i xDrive Base Model or 840i xDrive Gran Coupe | View on Amazon |
| TIMKEN | SL260527 | 🇺🇸 US | Rear | View on Amazon |
This table covers the seals at the differential pinion yoke. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
3 Differential Pinion Seal parts are listed for the 2021 BMW 840I, from TIMKEN and AJUSA.
Part numbers include AJUSA 12015650, TIMKEN SL260487 and TIMKEN SL260527.
Differential Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING | 729370 | 🇺🇸 US | Height [MM]: 10Swirl Type: Right-hand Twist | View on Amazon |
| ELRING | 761160 | 🇺🇸 US | Material: ACM (Polyacrylate)Radial Shaft Seal Design: AS | View on Amazon |
| ELRING | B16790 | 🇺🇸 US | Material: AEM (Ethylene Acrylate Rubber)Swirl Type: Alternating Twist | View on Amazon |
| ELRING | B46610 | 🇺🇸 US | Material: ACM (Polyacrylate)Radial Shaft Seal Design: AwithBS2 | View on Amazon |
This table covers the seals at the Differential. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
4 Differential Seal parts for the 2021 BMW 840I come from ELRING.
This group includes ELRING 729370, ELRING 761160 and ELRING B16790 and the remaining parts above.
Drive Shaft Center Support Bearing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | BEM0039P | 🇺🇸 US | 840i xDrive Base Model55mm O.D., 30mm I.D. | View on Amazon |
This table covers the Drive Shaft Center Support bearings. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly.
This group shows a single part: REIN BEM0039P.
Drive Shaft Flex Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AAE | FJC0107 | 🇺🇸 US | Fits Front840i xDrive Gran Coup | View on Amazon |
| SKF | VKJF98003 | 🇺🇸 US | Rear Driveshaft at Transfer Case840i xDrive Base Model | View on Amazon |
| ÜRO PARTS | 26111229360 | 🇺🇸 US | Front840i xDrive Base Model or 840i xDrive Gran Coupe | View on Amazon |
| ÜRO PARTS | 26117610061 | 🇺🇸 US | Fits Rear840i xDrive Gran Coup | View on Amazon |
This table covers the flex joints in the driveshaft.
4 Drive Shaft Flex Joint parts are listed for the 2021 BMW 840I, from ÜRO PARTS, AAE and SKF.
This group includes AAE FJC0107, SKF VKJF98003 and ÜRO PARTS 26111229360 and the remaining parts above.
Drive Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING | B15590 | 🇺🇸 US | Flange Seal | View on Amazon |
This table covers the seals at the Drive Shaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
One part is listed for the 2021 BMW 840I — ELRING B15590.
Gear Oil
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 915052 | 🇺🇸 US | Advanced Full Synthetic SAE 75W-85 Gear Oil1 Gallon | View on Amazon |
| VALVOLINE | 915053 | 🇺🇸 US | Advanced Full Synthetic SAE 75W-85 Gear Oil1 Quart Flex Fill | View on Amazon |
This table covers the gear oils specified for the axle or transfer case. Typical signs include a low-oil lamp, knocking, or oil that has gone thin before the next interval. Match the viscosity and spec in the notes, not just the weight on the bottle.
VALVOLINE supplies both parts for the 2021 BMW 840I.
Listed part numbers: VALVOLINE 915052 and VALVOLINE 915053.
Transfer Case Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | FLDF005 | 🇺🇸 US | 840i xDrive Base Model or 840i xDrive Gran CoupeTF0870 | View on Amazon |
This table covers the fluids specified for the transfer case. Typical signs include discolored fluid, a burnt smell, or a level that keeps dropping. Use only the specification in the notes — the tables group grades because they are not interchangeable.
One part is listed for the 2021 BMW 840I — REIN FLDF005.
Transfer Case Oil Drain Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | HWP0065 | 🇺🇸 US | 840i xDrive Base Model or 840i xDrive Gran CoupeM22X1.5, Steel | View on Amazon |
| REIN | HWU0065 | 🇺🇸 US | 840i xDrive Base Model or 840i xDrive Gran CoupeM22X1.5, Aluminum | View on Amazon |
This table covers the Transfer Case Oil drain plugs.
REIN supplies both parts for the 2021 BMW 840I.
This group includes REIN HWP0065 and REIN HWU0065.
Buying Drivetrain Parts for a 2021 BMW 840I
On this vehicle, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware.
- 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 the differential or transfer-case fluid with any axle or seal job while everything is already open.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Differential Seal and Drive Shaft Flex Joint .
Frequently Asked Questions
How many drivetrain parts fit the 2021 BMW 840I?
Our catalog currently lists 27 drivetrain parts for the 2021 BMW 840I across 12 subcategories and 10 brands, covering the 3.0L L6 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of drivetrain problems on a 2021 BMW 840I?
Common symptoms include clicking in tight turns, a clunk when shifting between drive and reverse, vibration that builds with speed, or gear oil on the inside of a wheel. 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 the differential or transfer-case fluid with any axle or seal job while everything is already open.
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 a torn CV boot caught early is a cheap boot kit; caught late it is a whole axle — inspect before deciding which to buy. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 BMW 840I
Drivetrain Parts for Other BMW 840I Years
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