This page lists 42 drivetrain parts for the 2018 Audi A8, across 7 part types, covering all 3 engine options (3.0L V6 Supercharged, 4.0L V8 Turbocharged and 6.3L W12). Every part shows its brand, manufacturer part number and fitment notes.
On the 2018 Audi A8, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. 34 parts of the 42 listed are CV Axle (20 parts), CV Joint Boot (10 parts) and CV Joint (4 parts). The other 4 part types cover the remaining 8 parts.
The 2018 Audi A8 was sold with 3 engines. 24 parts fit every engine; the other 18 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2018 Audi A8 drivetrain parts are GSP (9 parts), TOP NOTCH (8 parts) and TRAKMOTIVE (5 parts), plus 8 more brands. Quality grades include Standard Replacement and Premium.
6 parts on this 2018 Audi A8 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including TOP NOTCH TN19013PR (CV Axle) and BECK/ARNLEY 1033141 (CV Joint Boot). Click any part number to see every vehicle that part fits.
Axle Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN Fits: all 2018 A8 engines | SL260495 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | RearActive Differential , 67 x 83 x 8mm | View on Amazon |
| TIMKEN Fits: all 2018 A8 engines | SL260502 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | RearExc.Active Differential , 60 x 10 x 45mm | 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 2018 Audi A8 come from TIMKEN. Every part fits all 3 engine options (3.0L V6 Supercharged, 4.0L V8 Turbocharged and 6.3L W12).
Part numbers include TIMKEN SL260495 and TIMKEN SL260502.
CV Axle
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TOP NOTCH Popular Fits: all 2018 A8 engines | TN19013PR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Performance | View on Amazon |
| GSP Fits: all 2018 A8 engines | PR23019 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Performance Revolution | View on Amazon |
| GSP Fits: all 2018 A8 engines | PR23017 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Performance Revolution | View on Amazon |
| GSP Fits: all 2018 A8 engines | PR23020 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Performance Revolution | View on Amazon |
| GSP Fits: all 2018 A8 engines | PR23008 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Performance Revolution | View on Amazon |
| TOP NOTCH Fits: all 2018 A8 engines | TN19011PR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Performance | View on Amazon |
| TOP NOTCH Fits: all 2018 A8 engines | TN19014PR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Performance | View on Amazon |
| TOP NOTCH Fits: all 2018 A8 engines | TN19005PR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Performance | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GSP Popular Fits: all 2018 A8 engines | NCV23019 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front | View on Amazon |
| TOP NOTCH Popular Fits: all 2018 A8 engines | TN19013 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front | View on Amazon |
| TRAKMOTIVE Popular Fits: all 2018 A8 engines | AD8162 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | AAR Joint Design | View on Amazon |
| CARDONE Fits: all 2018 A8 engines | 667483 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Rear Leftwithout Sport Differential | View on Amazon |
| GSP Fits: all 2018 A8 engines | NCV23017 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear Rightwith Sport Differential | View on Amazon |
| GSP Fits: all 2018 A8 engines | NCV23020 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear Leftwith Sport Differential | View on Amazon |
| GSP Fits: all 2018 A8 engines | NCV23008 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rearwithout Sport Differential | View on Amazon |
| TOP NOTCH Fits: all 2018 A8 engines | TN19014 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear Leftwith Sport Differential | View on Amazon |
| TOP NOTCH Fits: all 2018 A8 engines | TN19005 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rearwithout Sport Differential | View on Amazon |
| TRAKMOTIVE Fits: all 2018 A8 engines | AD8189 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rearwithout Torque Vectoring Differential | View on Amazon |
| TRAKMOTIVE Fits: all 2018 A8 engines | AD8196 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear Leftwith Torque Vectoring | View on Amazon |
| TRAKMOTIVE Fits: all 2018 A8 engines | AD8197 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear Rightwith Torque Vectoring Differential | 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.
20 CV Axle parts for the 2018 Audi A8 come from 4 brands — GSP, TOP NOTCH, TRAKMOTIVE and 1 other brand. The "Popular" part is TOP NOTCH TN19013PR. Every part fits all 3 engine options (3.0L V6 Supercharged, 4.0L V8 Turbocharged and 6.3L W12).
In the Premium grade, TOP NOTCH and GSP supply 8 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is TOP NOTCH TN19013PR.
In the Standard Replacement grade, GSP, TRAKMOTIVE, TOP NOTCH and 1 other brand supply 12 parts: built to original-equipment specification. A representative part number is GSP NCV23019.
CV Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GKN Fits: 4.0L V8 Turbocharged | 306654 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Thermosplastic Elastomer (TPE) | View on Amazon |
| GKN Fits: 4.0L V8 Turbocharged | 306275 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pre-lubricatedThermosplastic Elastomer (TPE) | View on Amazon |
| MARELLI Fits: all 2018 A8 engines | TDS0420 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front | View on Amazon |
| MARELLI Fits: all 2018 A8 engines | TOJ0041 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front | View on Amazon |
This table covers the constant-velocity joints at each end of a drive axle.
4 CV Joint parts for the 2018 Audi A8 come from 2 brands — GKN and MARELLI. 2 parts fit every engine; the other 2 are engine-specific.
Part numbers include GKN 306654, GKN 306275 and MARELLI TDS0420, among others listed above.
CV Joint Boot
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Popular Fits: 4.0L V8 Turbocharged, 6.3L W12 | 1033141 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Outer | View on Amazon |
| REIN Popular Fits: 4.0L V8 Turbocharged | BKN0124 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear Inner | View on Amazon |
| BECK/ARNLEY Fits: 4.0L V8 Turbocharged, 6.3L W12 | 1032978 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear Inner | View on Amazon |
| BECK/ARNLEY Fits: 4.0L V8 Turbocharged, 6.3L W12 | 1033043 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Inner | View on Amazon |
| GKN Fits: 4.0L V8 Turbocharged | 304936 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Does Not contain CapThermoplastic Elastomer | View on Amazon |
| GKN Fits: 4.0L V8 Turbocharged | 305061 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Thermoplastic ElastomerThermosplastic Elastomer (TPE) | View on Amazon |
| GKN Fits: 4.0L V8 Turbocharged | 306313 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | OUTER Diameter 1.023 InThermoplastic Elastomer | View on Amazon |
| REIN Fits: 4.0L V8 Turbocharged | BKN0170 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Inner | View on Amazon |
| VAICO Fits: 4.0L V8 Turbocharged | V105635 | 🇺🇸 US | Front OuterGrade: AM | View on Amazon |
| VAICO Fits: 4.0L V8 Turbocharged | V105633 | 🇺🇸 US | Front InnerGrade: AM | 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.
10 CV Joint Boot parts for the 2018 Audi A8 come from 4 brands — BECK/ARNLEY, GKN, REIN and 1 other brand. The "Popular" part is BECK/ARNLEY 1033141.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN Fits: 4.0L V8 Turbocharged | SL260602 | 🇺🇸 US 🇨🇦 CA | RearL Model or L Sport | 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: TIMKEN SL260602.
Differential Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 4.0L V8 Turbocharged | 852090 | 🇨🇦 CA | Material: ACM (Polyacrylate)Radial Shaft Seal Design: A/BS2 | View on Amazon |
| ELRING Fits: 4.0L V8 Turbocharged | 096500 | 🇨🇦 CA | Height [MM]: 7Radial Shaft Seal Design: ASW | 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 2018 Audi A8.
Listed part numbers: ELRING 852090 and ELRING 096500.
Drive Shaft
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GSP Fits: 6.3L W12 | PS900106 | 🇲🇽 MX | Rear2 Piece Shaft | View on Amazon |
| TOP NOTCH Fits: 6.3L W12 | TN2317PS | 🇲🇽 MX | Rear2 Piece Shaft | View on Amazon |
| TRAKMOTIVE Fits: 6.3L W12 | ADP003 | 🇲🇽 MX | Rear | View on Amazon |
This table covers the driveshafts that carry torque from the transmission or transfer case.
3 Drive Shaft parts are listed for the 2018 Audi A8, from GSP, TOP NOTCH and TRAKMOTIVE.
This group includes GSP PS900106, TOP NOTCH TN2317PS and TRAKMOTIVE ADP003.
Buying Drivetrain Parts for a 2018 Audi A8
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 CV Joint Boot .
Frequently Asked Questions
How many drivetrain parts fit the 2018 Audi A8?
Our catalog currently lists 42 drivetrain parts for the 2018 Audi A8 across 7 subcategories and 11 brands, covering all 3 engine options (3.0L V6 Supercharged, 4.0L V8 Turbocharged and 6.3L W12). Each part is matched to the engine(s) it fits.
Do drivetrain parts differ between 2018 Audi A8 engines?
Some do. 24 parts fit every engine; the other 18 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 2018 Audi A8?
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 2018 Audi A8 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 2018 Audi A8?
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 2018 Audi A8
Drivetrain Parts for Other Audi A8 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.