This page lists 13 drivetrain parts for the 2026 BMW M440I, across 9 part types, covering the 3.0L L6 Turbocharged engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 2026 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 Differential Fill / Drain Plug (2 parts), Drive Shaft (2 parts) and Gear Oil (2 parts). The other 6 part types cover the remaining 7 parts.
The 2026 BMW M440I came with a single engine, the 3.0L L6 Turbocharged, and every part is verified against it.
5 brands supply drivetrain parts for the 2026 BMW M440I, led by REIN (6 parts), AJUSA (2 parts) and DORMAN (2 parts), plus 2 more brands.
Each part number listed for the 2026 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.
One part is listed for the 2026 BMW M440I — REIN HWB1067.
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.
One part is listed for the 2026 BMW M440I — 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 2026 BMW M440I.
Listed part numbers: 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.
One part is listed for the 2026 BMW M440I — AJUSA 12015650.
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 |
This table covers the driveshafts that carry torque from the transmission or transfer case.
2 Drive Shaft parts for the 2026 BMW M440I come from DORMAN.
Listed part numbers: DORMAN 986962 and DORMAN 966478.
Drive Shaft Flex Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AAE | FJC0107 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontM440i xDrive Base Model or M440i xDrive Gran Coupe | View on Amazon |
This table covers the flex joints in the driveshaft.
One part is listed for the 2026 BMW M440I — 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.
VALVOLINE supplies both parts for the 2026 BMW M440I.
Part numbers include 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.
One part is listed for the 2026 BMW M440I — 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.
REIN supplies both parts for the 2026 BMW M440I.
This group includes REIN HWP0065 and REIN HWU0065.
Buying Drivetrain Parts for a 2026 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: Differential Fill / Drain Plug and Drive Shaft .
Frequently Asked Questions
How many drivetrain parts fit the 2026 BMW M440I?
Our catalog currently lists 13 drivetrain parts for the 2026 BMW M440I across 9 subcategories and 5 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 2026 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 2026 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 2026 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 2026 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.