The 2021 BMW M340I has 32 drivetrain parts with verified fitment on this page — 13 part types and 15 brands, covering the 3.0L L6 Turbocharged engine. Each part includes a manufacturer part number and application notes.
The drivetrain system on the 2021 BMW M340I moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. The largest groups are CV Axle (5 parts), Drive Shaft Flex Joint (5 parts) and Drive Shaft (4 parts). The other 10 part types cover the remaining 18 parts.
The 2021 BMW M340I came with a single engine, the 3.0L L6 Turbocharged, and every part is verified against it.
15 brands supply drivetrain parts for the 2021 BMW M340I, led by REIN (5 parts), TIMKEN (4 parts) and ELRING (4 parts), plus 12 more brands.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 BMW M340I. 1 part has it: TOP NOTCH TN10075 (CV Axle). Each part number opens a page with every vehicle that part fits.
Axle Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN | SL260162 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontAWD | View on Amazon |
| TIMKEN | SL260496 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
TIMKEN supplies both parts for the 2021 BMW M340I.
Part numbers include TIMKEN SL260162 and TIMKEN SL260496.
CV Axle
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TOP NOTCH Popular | TN10075 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front LeftM340i xDrive | View on Amazon |
| GSP | NCV27108 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front LeftM340i xDrive | View on Amazon |
| GSP | NCV27109 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front RightM340i xDrive | View on Amazon |
| TOP NOTCH | TN10076 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front RightM340i xDrive | View on Amazon |
| TRAKMOTIVE | BM86037 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | AAR Joint Design | View on Amazon |
This table covers the complete CV axle shafts from differential (or hub) to wheel. Typical signs include a click in tight turns, grease flung around the wheel well, or a vibration that builds with speed. A torn boot caught early is a boot kit; caught late it is the whole axle. Torque the axle nut to the method in the notes.
5 CV Axle parts are listed for the 2021 BMW M340I, from TOP NOTCH, GSP and TRAKMOTIVE. TOP NOTCH TN10075 carries the "Popular" badge.
Part numbers include TOP NOTCH TN10075, GSP NCV27108 and GSP NCV27109, among others listed above.
CV Joint Boot
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GKN | 306831 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
One part is listed for the 2021 BMW M340I — GKN 306831.
Differential Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 16031150 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontM340i xDrive | 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 M340I — AJUSA 16031150.
Differential Fill / Drain Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | HWP0065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Rear DifferentialM22X1.5, Steel | View on Amazon |
| REIN | HWU0065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Rear DifferentialM22X1.5, Aluminum | View on Amazon |
This table covers the Differential Fill drain plugs.
REIN supplies both parts for the 2021 BMW M340I.
Part numbers include REIN HWP0065 and REIN HWU0065.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 12015650 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontM340i xDrive | View on Amazon |
| TIMKEN | SL260487 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontM340i xDrive | View on Amazon |
| TIMKEN | SL260527 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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 M340I, from TIMKEN and AJUSA.
Listed part numbers: AJUSA 12015650, TIMKEN SL260487 and TIMKEN SL260527.
Differential Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING | 729370 | 🇲🇽 MX | Height [MM]: 10Swirl Type: Right-hand Twist | View on Amazon |
| ELRING | 761160 | 🇲🇽 MX | Material: ACM (Polyacrylate)Radial Shaft Seal Design: AS | View on Amazon |
| ELRING | B16790 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Material: AEM (Ethylene Acrylate Rubber)Swirl Type: Alternating Twist | 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.
3 Differential Seal parts for the 2021 BMW M340I come from ELRING.
Listed part numbers: ELRING 729370, ELRING 761160 and ELRING B16790.
Drive Shaft
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 986962 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Length: 48" | View on Amazon |
| DORMAN | 966478 | 🇺🇸 US | Length: 55.75" | View on Amazon |
| DORMAN | 966488 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Length: 51"OE Fix | View on Amazon |
| WJB / INMOTION PARTS | WDS86962 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | RearAWD | View on Amazon |
This table covers the driveshafts that carry torque from the transmission or transfer case.
4 Drive Shaft parts for the 2021 BMW M340I come from 2 brands — DORMAN and WJB / INMOTION PARTS.
Listed part numbers: DORMAN 986962, DORMAN 966478 and DORMAN 966488, plus the other parts above.
Drive Shaft Flex Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AAE | FJC0107 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontM340i xDrive | View on Amazon |
| DORMAN | 935117 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear Driveshaft at Rear AxleAWD | View on Amazon |
| LARES | 31805 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M340i xDriveRear Driveshaft At Rear Axle | View on Amazon |
| ÜRO PARTS | 26117610061 | 🇺🇸 US | RearM340i Base Model | View on Amazon |
| VAICO | V202972 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Does Not Includeattachment material | View on Amazon |
This table covers the flex joints in the driveshaft.
5 Drive Shaft Flex Joint parts are listed for the 2021 BMW M340I, from AAE, DORMAN, LARES and 2 other brands.
Part numbers include AAE FJC0107, DORMAN 935117 and LARES 31805, among others listed above.
Drive Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING | B15590 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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 M340I — ELRING B15590.
Gear Oil
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 915052 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-85 Gear Oil1 Gallon | View on Amazon |
| VALVOLINE | 915053 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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 M340I.
Listed part numbers: VALVOLINE 915052 and VALVOLINE 915053.
Transfer Case Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | FLDF005 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M340i xDriveTF0870 | 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 M340I — REIN FLDF005.
Transfer Case Oil Drain Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | HWP0065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M340i xDriveM22X1.5, Steel | View on Amazon |
| REIN | HWU0065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M340i xDriveM22X1.5, Aluminum | View on Amazon |
This table covers the Transfer Case Oil drain plugs.
REIN supplies both parts for the 2021 BMW M340I.
This group includes REIN HWP0065 and REIN HWU0065.
Buying Drivetrain Parts for a 2021 BMW M340I
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: CV Axle and Drive Shaft Flex Joint .
Frequently Asked Questions
How many drivetrain parts fit the 2021 BMW M340I?
Our catalog currently lists 32 drivetrain parts for the 2021 BMW M340I across 13 subcategories and 15 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 M340I?
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 M340I 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 M340I?
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 M340I
Drivetrain Parts for Other BMW M340I 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.