This page lists 20 drivetrain parts for the 2025 BMW M440I, across 12 part types, covering the 3.0L L6 Turbocharged engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 2025 BMW M440I, 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 CV Axle (4 parts), Drive Shaft (3 parts) and Differential Fill / Drain Plug (2 parts). The other 9 part types cover the remaining 11 parts.
Every part on this page is matched to the 3.0L L6 Turbocharged — the only engine offered in the 2025 BMW M440I.
The most listed brands for 2025 BMW M440I drivetrain parts are REIN (6 parts), GKN (5 parts) and DORMAN (3 parts), plus 4 more brands.
Each part number listed for the 2025 BMW M440I opens a page with every vehicle that part fits.
Axle Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | HWB1067 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | RearM440i Gran Coupe or M440i xDrive Gran Coupe | View on Amazon |
This table covers the Axle bolts.
This group shows a single part: REIN HWB1067.
CV Axle
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GKN | GKND30023 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Compressed Length: 33.661 InOUTER Diameter 2.559 In | View on Amazon |
| GKN | GKND30024 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Compressed Length: 21.811 InOUTER Diameter 2.559 In | View on Amazon |
| GKN | GKND30025 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Compressed Length: 22.204 InOUTER Diameter 2.559 In | View on Amazon |
| GKN | GKND30026 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Compressed Length: 34.055 InOUTER Diameter 2.559 In | 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.
4 CV Axle parts for the 2025 BMW M440I come from GKN.
This group includes GKN GKND30023, GKN GKND30024 and GKN GKND30025 and the remaining parts 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.
This group shows a single part: GKN 306831.
Differential Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 16031150 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontM440i xDrive Base Model or M440i 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.
This group shows a single part: 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.
2 Differential Fill / Drain Plug parts for the 2025 BMW M440I come from REIN.
Part numbers include REIN HWP0065 and REIN HWU0065.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 12015650 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontM440i xDrive Base Model or M440i xDrive Gran Coupe | 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.
This group shows a single part: AJUSA 12015650.
Differential Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| 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.
One part is listed for the 2025 BMW M440I — 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 |
This table covers the driveshafts that carry torque from the transmission or transfer case.
DORMAN supplies the 3 Drive Shaft parts for the 2025 BMW M440I.
This group includes DORMAN 986962, DORMAN 966478 and DORMAN 966488.
Drive Shaft Flex Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AAE | FJC0107 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits M440i xDrive Gran Coupe | View on Amazon |
This table covers the flex joints in the driveshaft.
This group shows a single part: AAE FJC0107.
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.
2 Gear Oil parts for the 2025 BMW M440I come from VALVOLINE.
Listed part numbers: VALVOLINE 915052 and VALVOLINE 915053.
Transfer Case Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | FLDF005 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M440i xDrive Base Model or M440i 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.
This group shows a single part: REIN FLDF005.
Transfer Case Oil Drain Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | HWP0065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M440i xDrive Base Model or M440i xDrive Gran CoupeM22X1.5, Steel | View on Amazon |
| REIN | HWU0065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M440i xDrive Base Model or M440i xDrive Gran CoupeM22X1.5, Aluminum | View on Amazon |
This table covers the Transfer Case Oil drain plugs.
2 Transfer Case Oil Drain Plug parts for the 2025 BMW M440I come from REIN.
Part numbers include REIN HWP0065 and REIN HWU0065.
Buying Drivetrain Parts for a 2025 BMW M440I
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 .
Frequently Asked Questions
How many drivetrain parts fit the 2025 BMW M440I?
Our catalog currently lists 20 drivetrain parts for the 2025 BMW M440I across 12 subcategories and 7 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 2025 BMW M440I?
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 2025 BMW M440I 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 2025 BMW M440I?
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 2025 BMW M440I
Drivetrain Parts for Other BMW M440I 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.