A Guide to the Automatic Transmission Mount for the 2011-2016 Audi A4
If you're feeling strange vibrations or hearing clunking noises, your A4's transmission mount could be the problem.
- Key symptoms of failure are clunking noises when shifting and vibrations at idle.
- Replacement is a simple DIY task for many owners, often taking less than an hour with basic tools.
- Be cautious of budget aftermarket brands like Anchor and DEA, as forum users report they can increase vibration and fail quickly.
- Always inspect your engine mounts at the same time, as they can cause similar symptoms and are also a common failure point.
Symptoms of a Failing Transmission Mount
When the transmission mount wears out, it can no longer do its job of absorbing vibration and securing the transmission. This leads to several noticeable symptoms. A failing mount can also put extra stress on other parts like the engine mounts, driveshaft, and CV axles.
- Excessive Vibrations: This is the most common sign. You may feel a strong vibration through the floor, seats, or steering wheel. It is often worst when the car is idling in gear (like at a stoplight) or during acceleration.
- Clunking or Banging Noises: Loud clunks, bangs, or thumps when you shift gears—especially from Park to Drive or Reverse—are a clear indicator of a bad mount. This noise is the sound of the transmission moving excessively and hitting the car's frame.
- Rough Shifting: A worn mount can cause poor drivetrain alignment, which may lead to rough or jerky shifting.
Inspect Your Engine Mounts, Too
The symptoms of a bad transmission mount are very similar to those of failing engine mounts, which are also common on the B8 platform A4. Since you are already inspecting the drivetrain, it is a wise idea to check the condition of your engine mounts at the same time. Look for leaking fluid or collapsed rubber.
Choosing the Right Aftermarket Part
When replacing the transmission mount on your Audi, you have a choice between Original Equipment (OEM) and aftermarket parts. For a sensitive German car, the quality of the mount makes a big difference in ride quality.
- OEM Quality: The original factory mount is designed specifically for your A4 to provide the best balance of performance and comfort. Many Audi mounts are fluid-filled to absorb the maximum amount of vibration. This is the safest but most expensive option.
- Aftermarket Quality: The quality of aftermarket mounts varies widely. For this specific part on an Audi, choosing the wrong brand can lead to problems.
A Note on Aftermarket Brands
When shopping for an aftermarket transmission mount, brand reputation is critical. Be cautious with budget-friendly options.
- Anchor and DEA: These brands are widely available and offer a low price. However, in numerous online forums for various vehicles, owners and mechanics report that these mounts are made from harder rubber compounds that can increase cabin vibration. Many users have reported premature failure, sometimes in a matter of months, leading them to do the repair a second time with a higher-quality part.
- Pioneer Cable: This brand is known for making automotive cables, such as shifter cables. There is very little to no information available that suggests they manufacture rubber or metal transmission mounts.
Consider an Insert as an Alternative
The factory B8 A4 transmission mount has a large open space, or void, in its rubber. Many owners choose to install a billet aluminum or polyurethane "insert" that fills this void. This is a popular and simple modification that reduces drivetrain movement, resulting in crisper shifts. However, be aware that using a very stiff insert can increase noise and vibration inside the car.
Replacement Cost
The cost to replace the transmission mount depends on the parts you choose and who does the work. The job is simple enough for many DIY mechanics to perform at home.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $67.88 - $83.69 |
| New OEM Part | $150 - $250 |
| Shop Labor | $75 - $150 |
| Total (Shop Repair) | $225 - $400 |
Frequently Asked Questions (FAQ)
Can I drive with a bad transmission mount?
Yes, but it is not recommended for long. Continuing to drive puts extra stress on your engine mounts, CV axles, and driveshaft, which can lead to more expensive repairs down the road.
Is a transmission mount the same as an engine mount?
No. While they perform a similar function, they are separate parts. Your A4 has two engine mounts and one transmission mount. They all work together to secure the powertrain.
Will a new aftermarket mount feel different than the original?
It might. Aftermarket mounts, especially budget brands, often use solid, hard rubber instead of the softer or fluid-filled OEM design. This can cause a noticeable increase in vibration at idle and during acceleration.
How difficult is it to replace the transmission mount myself?
For the 2011-2016 A4, this is a relatively easy DIY job. It typically takes about 30-60 minutes and requires basic tools, including a 10mm triple square socket. You will need to safely raise the vehicle on jack stands or ramps to get access.
Technical Specifications
OEM Part Numbers: 8K0399151BD 8K0399151DB 8K0399151CD
The B8 platform transmission mount is a single, centrally located mount that bolts to the transmission and a subframe crossmember. It is often a fluid-filled or voided rubber design from the factory.
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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.
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