56 Drivetrain parts are listed for the 2021 Audi TT, in 12 part types, covering both the 2.0L L4 Turbocharged and the 2.5L L5 Turbocharged. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2021 Audi TT, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. 27 parts of the 56 listed are CV Axle (10 parts), Transfer Case Fluid (9 parts) and Gear Oil (8 parts). The other 9 part types cover the remaining 29 parts.
The 2021 Audi TT was sold with both the 2.0L L4 Turbocharged and the 2.5L L5 Turbocharged. 29 parts fit every engine; the other 27 are engine-specific. Each part shows which engine(s) it fits.
14 brands supply drivetrain parts for the 2021 Audi TT, led by VAICO (14 parts), VALVOLINE (14 parts) and GKN (10 parts), plus 11 more brands.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Audi TT. 10 parts have it, including VAICO V106827 (AWD Coupling Oil Pump) and APWI AD8383 (CV Axle). Each part number opens a page with every vehicle that part fits.
AWD Coupling Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN Fits: all 2021 TT engines | FLDF003 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Haldex850 ml | View on Amazon |
| VAICO Fits: all 2021 TT engines | V600450 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Differential Oil, 850 ML | View on Amazon |
This table covers the AWD Coupling fluids. 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.
2 AWD Coupling Fluid parts are listed for the 2021 Audi TT, from REIN and VAICO. All of them fit every engine offered in the 2021 TT.
Listed part numbers: REIN FLDF003 and VAICO V600450.
AWD Coupling Oil Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO Fits: all 2021 TT engines | V106662 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the AWD Coupling Oil filters. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for.
One part is listed for the 2021 Audi TT — VAICO V106662.
AWD Coupling Oil Pump
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO Popular Fits: all 2021 TT engines | V106827 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes: Pump, Oil drain plugs, Complete Kit | View on Amazon |
| AAE Fits: all 2021 TT engines | DLA0107 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| VAICO Fits: all 2021 TT engines | V106603 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes: Oil drain plugs | View on Amazon |
| VAICO Fits: all 2021 TT engines | V106826 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Complete KitIncludes: Pump, Oil, Screws | View on Amazon |
| VAICO Fits: all 2021 TT engines | V105600XXL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes: Hydraulic Filter, Hydraulic Oil, Drain Plugs, Seal Ring, Gasket-Set | View on Amazon |
This table covers the AWD Coupling Oil pumps. Typical signs include noise from the pump, no pressure, or fluid that never arrives at the outlet. Prime or fill the pump as the notes require. A dry start is a common way to kill a new unit.
5 AWD Coupling Oil Pump parts are listed for the 2021 Audi TT, from VAICO and AAE. VAICO V106827 carries the "Popular" badge. All of them fit every engine offered in the 2021 TT.
Listed part numbers: VAICO V106827, AAE DLA0107 and VAICO V106603, plus the other parts above.
CV Axle
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| APWI Popular Fits: 2.5L L5 Turbocharged | AD8383 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | View on Amazon |
| TOP NOTCH Popular Fits: 2.0L L4 Turbocharged | TN19036 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | View on Amazon |
| GKN Fits: 2.5L L5 Turbocharged | 305771 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Front RightLength 603 mm | View on Amazon |
| GKN Fits: 2.5L L5 Turbocharged | 306629 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front LeftLength 561 mm | View on Amazon |
| GSP Fits: 2.0L L4 Turbocharged | NCV23038 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear Left | View on Amazon |
| GSP Fits: 2.0L L4 Turbocharged | NCV23048 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | View on Amazon |
| GSP Fits: 2.0L L4 Turbocharged | NCV72144 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear Right | View on Amazon |
| GSP Fits: 2.5L L5 Turbocharged | NCV23046 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | View on Amazon |
| TOP NOTCH Fits: 2.5L L5 Turbocharged | TN19034 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | View on Amazon |
| TRAKMOTIVE Fits: 2.0L L4 Turbocharged | AD8204 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front RightTTS Quattro | 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.
10 CV Axle parts are listed for the 2021 Audi TT, from GSP, TOP NOTCH, GKN and 2 other brands. APWI AD8383 carries the "Popular" badge.
CV Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GKN Popular Fits: all 2021 TT engines | 305448 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pre-lubricatedThermosplastic Elastomer (TPE) | View on Amazon |
| GKN Fits: 2.0L L4 Turbocharged | 305021 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Thermoplastic Elastomer | View on Amazon |
| GKN Fits: 2.0L L4 Turbocharged | 306653 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | OUTER Diameter 1.259 In | View on Amazon |
| MARELLI Fits: all 2021 TT engines | TOJ0312 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontTTS Quattro | View on Amazon |
| VAICO Fits: 2.0L L4 Turbocharged | V106914 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Rear Left Outer | View on Amazon |
| VAICO Fits: 2.0L L4 Turbocharged | V107736 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear Inner | View on Amazon |
| VAICO Fits: 2.5L L5 Turbocharged | V106922 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right Inner | View on Amazon |
This table covers the constant-velocity joints at each end of a drive axle.
7 CV Joint parts are listed for the 2021 Audi TT, from GKN, VAICO and MARELLI. GKN 305448 carries the "Popular" badge. 2 parts fit every engine; the other 5 are engine-specific.
Part numbers include GKN 305448, GKN 305021 and GKN 306653, among others listed above.
CV Joint Boot
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GKN Popular Fits: all 2021 TT engines | 305967 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Length: 123 mmThermoplastic Elastomer | View on Amazon |
| GKN Popular Fits: 2.0L L4 Turbocharged | 304936 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Does Not contain CapThermoplastic Elastomer | View on Amazon |
| BECK/ARNLEY Fits: 2.0L L4 Turbocharged | 1033193 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Inner | View on Amazon |
| BECK/ARNLEY Fits: 2.0L L4 Turbocharged | 1033194 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Outer | View on Amazon |
| GKN Fits: 2.0L L4 Turbocharged | 306131 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Thermoplastic ElastomerThermosplastic Elastomer (TPE) | View on Amazon |
| GKN Fits: 2.0L L4 Turbocharged | 306588 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Length: 125 mmThermoplastic Elastomer | View on Amazon |
| GKN Fits: 2.5L L5 Turbocharged | 306237 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | OUTER Diameter 1.063 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.
7 CV Joint Boot parts are listed for the 2021 Audi TT, from GKN and BECK/ARNLEY. GKN 305967 carries the "Popular" badge. 1 part fits every engine; the other 6 are engine-specific.
Listed part numbers: GKN 305967, GKN 304936 and BECK/ARNLEY 1033193, plus the other parts above.
Differential Mount
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VNE Fits: 2.0L L4 Turbocharged | 4009408 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | RearPositions 10, 11, 12 | View on Amazon |
| VNE Fits: 2.0L L4 Turbocharged | 4009409 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | RearPositions 7 and 8 | View on Amazon |
This table covers the Differential mounts. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes.
2 Differential Mount parts for the 2021 Audi TT come from VNE.
This group includes VNE 4009408 and VNE 4009409.
Differential Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 2.0L L4 Turbocharged | 877460 | 🇺🇸 US 🇨🇦 CA | Dust Cover: without dust LipSwirl Type: Alternating Twist | View on Amazon |
| ELRING Fits: 2.0L L4 Turbocharged | 871180 | 🇺🇸 US 🇨🇦 CA | Dust Cover: with dust LipInner Diameter [MM]: 67 | View on Amazon |
| VAICO Fits: 2.0L L4 Turbocharged | V103266 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Dimensions: 60X74,3X8 | 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 Audi TT come from 2 brands — ELRING and VAICO.
Part numbers include ELRING 877460, ELRING 871180 and VAICO V103266.
Drive Shaft Flex Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO Fits: 2.0L L4 Turbocharged | V1018008 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the flex joints in the driveshaft.
One part is listed for the 2021 Audi TT — VAICO V1018008.
Gear Oil
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular Fits: all 2021 TT engines | VV975 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Quart | View on Amazon |
| VALVOLINE Popular Fits: all 2021 TT engines | 889785 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | View on Amazon |
| VAICO Fits: all 2021 TT engines | V600364 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 850MLTransmission code : JJN, JUY, KJU, KMC, KMD, MMK, MML | View on Amazon |
| VALVOLINE Fits: all 2021 TT engines | 882505 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Gallon | View on Amazon |
| VALVOLINE Fits: all 2021 TT engines | 723856 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil5 Gallon | View on Amazon |
| VALVOLINE Fits: all 2021 TT engines | 819195 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | VPS Full Synthetic SAE 75W-90 Gear Oil1 Quart | View on Amazon |
| VALVOLINE Fits: all 2021 TT engines | 902146 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Extended Protection Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | View on Amazon |
| VALVOLINE Fits: all 2021 TT engines | 904644 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | VPS Full Synthetic SAE 75W-90 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.
8 Gear Oil parts are listed for the 2021 Audi TT, from VALVOLINE and VAICO. VALVOLINE VV975 carries the "Popular" badge. All of them fit every engine offered in the 2021 TT.
Listed part numbers: VALVOLINE VV975, VALVOLINE 889785 and VAICO V600364, plus the other parts above.
Transfer Case Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular Fits: all 2021 TT engines | VV975 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Quart | View on Amazon |
| VALVOLINE Popular Fits: all 2021 TT engines | 889785 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | View on Amazon |
| VAICO Fits: all 2021 TT engines | V10000270 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Description: Differential Fluid Change KitIncludes: Hydraulic Oil, Drain Plugs and Seal Rings | View on Amazon |
| VAICO Fits: all 2021 TT engines | V10000270XXL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Description: Differential Fluid Change KitIncludes: Hydraulic Oil, Hydraulic Filter, Drain Plugs, Seal Rings and Installation Hardware | View on Amazon |
| VALVOLINE Fits: all 2021 TT engines | 882505 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Gallon | View on Amazon |
| VALVOLINE Fits: all 2021 TT engines | 723856 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil5 Gallon | View on Amazon |
| VALVOLINE Fits: all 2021 TT engines | 819195 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | VPS Full Synthetic SAE 75W-90 Gear Oil1 Quart | View on Amazon |
| VALVOLINE Fits: all 2021 TT engines | 902146 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Extended Protection Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | View on Amazon |
| VALVOLINE Fits: all 2021 TT engines | 904644 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | VPS Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | 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.
9 Transfer Case Fluid parts are listed for the 2021 Audi TT, from VALVOLINE and VAICO. VALVOLINE VV975 carries the "Popular" badge. All of them fit every engine offered in the 2021 TT.
Listed part numbers: VALVOLINE VV975, VALVOLINE 889785 and VAICO V10000270, plus the other parts above.
Transfer Case Output Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN Fits: all 2021 TT engines | SL260505 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Rear | View on Amazon |
This table covers the seals at the Transfer Case Output 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 Audi TT — TIMKEN SL260505.
Buying Drivetrain Parts for a 2021 Audi TT
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 Transfer Case Fluid .
Frequently Asked Questions
How many drivetrain parts fit the 2021 Audi TT?
Our catalog currently lists 56 drivetrain parts for the 2021 Audi TT across 12 subcategories and 14 brands, covering both the 2.0L L4 Turbocharged and the 2.5L L5 Turbocharged. Each part is matched to the engine(s) it fits.
Do drivetrain parts differ between 2021 Audi TT engines?
Some do. 29 parts fit every engine; the other 27 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 Audi TT?
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 Audi TT 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 Audi TT?
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 Audi TT
Drivetrain Parts for Other Audi TT Years
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