A Guide to the 1994-2009 Mercedes-Benz E320 Automatic Transmission Mount
Eliminate drivetrain vibrations and clunking noises by understanding and choosing the right transmission mount for your E320.
- The most common symptoms of failure are vibrations in the seat/console at idle and a clunking noise when shifting.
- Replacement is a simple, DIY-friendly job that can be done in 1-2 hours with basic tools.
- For best results, choose a premium aftermarket brand like Corteco or Febi to restore the factory-smooth ride.
- It is highly recommended to inspect and likely replace the two engine mounts at the same time as the transmission mount.
Is Your E320 Vibrating or Clunking? It Could Be the Transmission Mount
A failing automatic transmission mount is a common issue on the Mercedes-Benz E320 as it ages. The rubber inside the mount cracks, hardens, or collapses from heat and stress. This allows the transmission to move excessively, leading to symptoms that degrade the car's refined feel. The most common signs of failure are vibrations felt in the seat and center console at idle, and a distinct 'clunk' or 'thump' when you shift into Drive or Reverse.
🎬 Watch: 7 signs of a bad transmission mount to look for.Don't Confuse it with Engine Mounts
Symptoms of a bad transmission mount are very similar to failing engine mounts. A key difference is where you feel the vibration. If the vibration is strongest in the steering wheel at idle, the engine mounts are the likely cause. If the vibration is felt more through the seats and floor, and gets worse when you shift into gear, the transmission mount is the primary suspect. It is common practice to replace all three mounts (two engine, one transmission) at the same time.
Choosing the Right Aftermarket Transmission Mount
When shopping for a replacement, you have several options that vary in quality and price. For a luxury vehicle like the E320, choosing a quality part is important to restore the original smooth ride.
- Premium Aftermarket (OEM-Equivalent): Brands like Corteco and Febi are often considered OEM (Original Equipment Manufacturer) suppliers for Mercedes-Benz or produce parts to the same specification. These mounts are designed to provide the same vibration absorption and lifespan as the original part. They are the recommended choice for most owners who want to restore factory ride quality.
- Standard Aftermarket: Brands such as Anchor, DEA, and Westar offer a more budget-friendly alternative. While functional, they may not offer the same level of damping or longevity as premium brands, potentially resulting in slightly more noticeable vibration.
- Specialty Aftermarket: Some brands like URO Parts fall into this category, with a reputation that can vary by part. For a critical comfort component like a mount, sticking with proven premium brands is a safer bet.
A Note on Polyurethane Mounts
You may find polyurethane transmission mounts available. While polyurethane is much more durable than rubber, it is also much stiffer. This type of mount will transfer more noise, vibration, and harshness (NVH) into the cabin and is generally recommended only for performance-focused applications, not for a comfortable daily driver.
Cost to Replace an E320 Transmission Mount
Replacing the transmission mount is one of the more affordable repairs for an E320. The part itself is not expensive, and the labor is straightforward.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $20 - $71 |
| New OEM Part | $70 - $120 |
| Shop Labor | $120 - $270 |
| Total Professional Replacement | $140 - $341 |
Cost estimates are for the part and labor only and do not include taxes, fees, or diagnosis. Prices can vary based on location and repair shop.
Frequently Asked Questions
Is it difficult to replace the transmission mount myself?
No, this is considered a very easy DIY job for someone with basic tools. The process involves supporting the transmission with a floor jack and a piece of wood, removing a few bolts, and swapping the old mount for the new one. The entire job can often be done in under an hour.
🎬 See this step-by-step walkthrough for replacing your W211 mount.How do I know for sure my transmission mount is bad?
Besides the symptoms of vibration and clunking, a visual inspection can confirm failure. Look for cracks in the rubber, or if the center of the mount has sagged significantly. When the transmission is jacked up slightly, a bad mount may stretch apart or show separation.
Are there any recalls for the E320 transmission mount?
No, there are no specific recalls or technical service bulletins (TSBs) from Mercedes-Benz or the NHTSA for the automatic transmission mount on the 1994-2009 E320. Failure is considered normal wear and tear.
Should I replace my engine mounts at the same time?
It is highly recommended. The engine and transmission mounts work together as a system. If the transmission mount has failed, the engine mounts have been subjected to extra stress and are likely worn as well. Replacing all three provides the best result for a smooth-feeling car.
🎬 Watch: DIY guide for replacing both engine and transmission mounts.Helpful Videos
Technical Specifications
OEM Part Numbers: 2122400418 2202400218 2122400318
The transmission mount for the E320 is a single, rear mount made of rubber and metal, designed to support the transmission and dampen vibration. Part numbers can vary by specific model year and drivetrain (RWD vs. 4Matic), so verifying fitment is crucial. The replacement procedure is similar across W124, W210, and W211 generations.
We Have This Part in Stock
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.
- Mercedes-Benz E320:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your E320 Vibrating or Clunking? It Could Be the Transmission Mount
- Don't Confuse it with Engine Mounts
- Choosing the Right Aftermarket Transmission Mount
- A Note on Polyurethane Mounts
- Cost to Replace an E320 Transmission Mount
- Frequently Asked Questions
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