Audi A6 (2011-2015) Automatic Transmission Mount Replacement Guide
Feeling vibrations or hearing clunks when you shift? Your C7 A6's transmission mount could be worn out.
- Key symptoms of a bad mount are clunking noises when shifting and increased vibration at idle.
- For the best ride quality, OEM or premium German aftermarket mounts are recommended over budget brands like Anchor or DEA for an Audi.
- Replacement is a manageable DIY job for those with the right tools, including triple square bits.
- Always inspect engine mounts when replacing the transmission mount, as they wear together.
Is Your A6's Transmission Mount Failing?
The transmission mount on the C7 generation Audi A6 is designed to last, but it can wear out over time, especially after 100,000 miles. When it fails, the symptoms can be subtle at first but will worsen. Ignoring them can lead to more stress on other expensive components.
Key Failure Symptoms
- Vibrations: You might feel a new vibration through the floor or seats, especially when the car is in gear at a stop, or during acceleration. This happens because the worn rubber can no longer absorb the drivetrain's vibrations.
- Clunking Noises: A common sign is a "clunk" or "thud" sound when you accelerate, decelerate, or shift between Drive and Reverse. This noise is the transmission moving excessively and hitting other parts because the mount is no longer holding it securely. 🎬 Watch a breakdown of common bad transmission mount symptoms.
- Rough Shifting: A worn mount can cause the transmission to be misaligned, leading to rough or jerky shifts. In severe cases, it can feel like the transmission is slipping or popping out of gear.
Known Issues & Bulletins
While there are no specific NHTSA recalls for the transmission mount on the 2011-2015 Audi A6, Audi has issued Technical Service Bulletins (TSBs) for similar models related to creaking noises from the mount area, especially when cold. This indicates that the original mounts can develop issues. Always check engine mounts at the same time, as they wear at a similar rate and a bad engine mount can put extra stress on the transmission mount.
🎬 Learn how to check your Audi's engine mounts for wear.Choosing a New Aftermarket Mount
When replacing the transmission mount on your A6, you have a choice between Original Equipment (OEM) and aftermarket parts. For a premium vehicle like an Audi, this choice matters.
- OEM (Original Equipment Manufacturer): This is the exact same part your car was built with. It guarantees perfect fit, material quality, and vibration absorption as intended by Audi engineers. It is the most expensive option.
- Aftermarket (Anchor, DEA): Brands like Anchor and DEA provide a more budget-friendly option. However, forum discussions and general mechanic consensus suggest that for European vehicles, these brands may not offer the same level of refinement or longevity as OEM. Owners sometimes report increased vibration (NVH - Noise, Vibration, and Harshness) or a shorter lifespan compared to the original part. They are a functional replacement to fix a completely failed mount on a budget, but may be a downgrade in ride quality.
Pro Tip: For an Audi A6, if you value the smooth, quiet ride, investing in an OEM or a high-quality German aftermarket brand (like Lemförder or Corteco, if available) is often recommended over standard budget brands. However, if cost is the primary concern, an Anchor or DEA mount will get the job done.
Replacement Cost
The cost to replace the transmission mount can vary based on whether you do it yourself or use a professional shop. The part itself is relatively affordable compared to the labor.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Part | $260 - $265 |
| New Aftermarket Parts (Anchor, DEA) | $83 - $103 |
| Shop Labor | $141 - $207 |
| Total Professional Replacement (OEM) | $403 - $472 |
Frequently Asked Questions (FAQ)
Is replacing the A6 transmission mount a DIY job?
Yes, for an experienced DIYer. The replacement is straightforward and doesn't require dropping the entire subframe. You will need a good set of tools, including 13mm sockets and M10/M12 triple square bits, a torque wrench, and a way to safely support the transmission with a jack. The process involves removing a splash shield and a crossmember to access the mount. Estimated time is 1-2 hours.
🎬 Follow this step-by-step guide to replace your A6 transmission mount.What's the difference between a transmission mount and an engine mount?
They perform the same function—securing the drivetrain and absorbing vibration—but in different locations. Engine mounts support the engine, while the transmission mount supports the gearbox. They are all part of the same system, and it's wise to inspect all of them if you suspect one has failed.
What is a transmission mount insert?
You may see "mount inserts" for sale. These are billet aluminum pieces that fill the voids in the original rubber mount. They are a performance upgrade designed to reduce drivetrain movement for crisper shifting, but they are not a replacement for a broken or worn-out mount. They can also slightly increase cabin vibration.
Will a new aftermarket mount feel different than the original?
Possibly. Budget aftermarket mounts may use a harder rubber compound or have a different design than the OEM part. This can sometimes lead to a slight increase in vibration felt inside the car, especially at idle. An OEM mount is the only way to guarantee the original ride feel.
Helpful Videos
Technical Specifications
OEM Part Numbers: 4M0399153AA 4G0399153A 8K0399151DD 8K0399151DB
The mount for the C7 A6 is a single, rear transmission mount that bolts to a subframe crossmember. It consists of a metal housing with a large rubber bushing designed with voids to dampen vibrations. The replacement procedure requires supporting the transmission, removing a crossmember, and unbolting the mount. Required tools include 13mm sockets and M10/M12 triple square bits.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Audi A6: