The 2021 BMW Z4 has 20 drivetrain parts with verified fitment on this page — 10 part types and 10 brands, covering both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. Each part includes a manufacturer part number and application notes.
The drivetrain system on the 2021 BMW Z4 moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. The largest groups are CV Axle (4 parts), Axle Shaft Seal (2 parts) and Differential Fill / Drain Plug (2 parts). The other 7 part types cover the remaining 12 parts.
The 2021 BMW Z4 was sold with both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. 9 parts fit every engine; the other 11 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 BMW Z4 drivetrain parts are REIN (3 parts), ELRING (3 parts) and AJUSA (2 parts), plus 7 more brands.
Each part number listed for the 2021 BMW Z4 opens a page with every vehicle that part fits.
Axle Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 2.0L L4 Turbocharged | 12021750 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rearwithout M Sport Differential | View on Amazon |
| TIMKEN Fits: all 2021 Z4 engines | SL260496 | 🇺🇸 US 🇨🇦 CA | 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.
2 Axle Shaft Seal parts for the 2021 BMW Z4 come from 2 brands — AJUSA and TIMKEN. 1 part fits every engine; the other 1 is engine-specific.
Listed part numbers: AJUSA 12021750 and TIMKEN SL260496.
CV Axle
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GSP Fits: 2.0L L4 Turbocharged | NCV27120 | 🇺🇸 US 🇨🇦 CA | Rear Rightwithout Sport Package (M) | View on Amazon |
| GSP Fits: 2.0L L4 Turbocharged | NCV27121 | 🇺🇸 US 🇨🇦 CA | Rear Leftwithout Sport Package (M) | View on Amazon |
| TOP NOTCH Fits: 2.0L L4 Turbocharged | TN10201 | 🇺🇸 US 🇨🇦 CA | Rear Leftwithout Sport Package (M) | View on Amazon |
| TOP NOTCH Fits: 2.0L L4 Turbocharged | TN10200 | 🇺🇸 US 🇨🇦 CA | Rear Rightwithout Sport Package (M) | 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 2021 BMW Z4 come from 2 brands — GSP and TOP NOTCH.
Listed part numbers: GSP NCV27120, GSP NCV27121 and TOP NOTCH TN10201, plus the other parts above.
Differential Fill / Drain Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN Fits: all 2021 Z4 engines | HWP0065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear DifferentialM22X1.5, Steel | View on Amazon |
| REIN Fits: all 2021 Z4 engines | HWU0065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear DifferentialM22X1.5, Aluminum | View on Amazon |
This table covers the Differential Fill drain plugs.
2 Differential Fill / Drain Plug parts for the 2021 BMW Z4 come from REIN. Every part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.
This group includes REIN HWP0065 and REIN HWU0065.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 2.0L L4 Turbocharged | 12005350 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear45 x 75 x 10 mm, without M Sport Differential | View on Amazon |
| TIMKEN Fits: all 2021 Z4 engines | SL260527 | 🇺🇸 US 🇨🇦 CA | 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.
2 Differential Pinion Seal parts for the 2021 BMW Z4 come from 2 brands — AJUSA and TIMKEN. 1 part fits every engine; the other 1 is engine-specific.
This group includes AJUSA 12005350 and TIMKEN SL260527.
Differential Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: all 2021 Z4 engines | 729370 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Height [MM]: 10Swirl Type: Right-hand Twist | View on Amazon |
| ELRING Fits: all 2021 Z4 engines | B46610 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
ELRING supplies both parts for the 2021 BMW Z4. All of them fit every engine offered in the 2021 Z4.
This group includes ELRING 729370 and ELRING B46610.
Drive Shaft
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 3.0L L6 Turbocharged | 986969 | 🇺🇸 US | Length: 38.375" | View on Amazon |
| WJB / INMOTION PARTS Fits: 3.0L L6 Turbocharged | WDS86969 | 🇺🇸 US | Rear | View on Amazon |
This table covers the driveshafts that carry torque from the transmission or transfer case.
2 Drive Shaft parts are listed for the 2021 BMW Z4, from DORMAN and WJB / INMOTION PARTS.
Part numbers include DORMAN 986969 and WJB / INMOTION PARTS WDS86969.
Drive Shaft Center Support Bearing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN Fits: 2.0L L4 Turbocharged | BEM0039P | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 55mm 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.
One part is listed for the 2021 BMW Z4 — REIN BEM0039P.
Drive Shaft Flex Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 2.0L L4 Turbocharged | 935118 | 🇺🇸 US 🇨🇦 CA | Front | View on Amazon |
| LARES Fits: 2.0L L4 Turbocharged | 31560 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front | View on Amazon |
This table covers the flex joints in the driveshaft.
2 Drive Shaft Flex Joint parts for the 2021 BMW Z4 come from 2 brands — DORMAN and LARES.
This group includes DORMAN 935118 and LARES 31560.
Drive Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: all 2021 Z4 engines | 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.
This group shows a single part: ELRING B15590.
Gear Oil
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Fits: all 2021 Z4 engines | 915052 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-85 Gear Oil1 Gallon | View on Amazon |
| VALVOLINE Fits: all 2021 Z4 engines | 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 2021 BMW Z4 come from VALVOLINE. Every part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.
This group includes VALVOLINE 915052 and VALVOLINE 915053.
Buying Drivetrain Parts for a 2021 BMW Z4
On this vehicle, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware.
- Match the engine first. Some drivetrain parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
- 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 Axle Shaft Seal .
Frequently Asked Questions
How many drivetrain parts fit the 2021 BMW Z4?
Our catalog currently lists 20 drivetrain parts for the 2021 BMW Z4 across 10 subcategories and 10 brands, covering both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. Each part is matched to the engine(s) it fits.
Do drivetrain parts differ between 2021 BMW Z4 engines?
Some do. 9 parts fit every engine; the other 11 are engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of drivetrain problems on a 2021 BMW Z4?
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 Z4 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 Z4?
First match the engine — each row shows which engine(s) the part fits. 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 Z4
Drivetrain Parts for Other BMW Z4 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.