DIY How to replace transmission mount Mercedes-Benz

Last updated: October 26, 2026

Introduction

If you have been experiencing vibration inside the cabin of your Mercedes-Benz, then your engine or transmission mounts may have failed. Typically, the vibrations are worse at idle and may be less noticeable when driving. Inspect the engine mounts and transmission mount and rule out other causes before replacing parts. This repair guide will show you how to replace the automatic transmission mount. Replacing the transmission mount is easy; you can change it in less than an hour. When it comes to motor mounts, do not replace them with used parts.

The transmission mount in a Mercedes-Benz is an essential component that helps to secure and support the transmission. Over time, due to wear and tear, the transmission mount may become damaged or worn out, leading to several issues, such as excessive vibration, transmission misalignment, and even damage to other components.

Replacing the transmission mount in a Mercedes-Benz can help restore the vehicle’s smooth operation and improve driving comfort. The process typically involves removing and replacing the old mount with a new one.

Make:	Mercedes-Benz
Model:	E CLA SLK ML S Class
Years:	1998 1999 2000 01 02 03 04 05 06 07 08 09 2010 11 12 13 15
Difficulty:	Easy
DIY Cost	$15-$45
Dealer Cost	$300-$500
Time:	45 Minutes

Tools Needed

• 16mm & 13mm wrench
• Jack Stands
• Floor Jack
• Push Clips Remover Tool

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The center of the mount is slightly shifted by design, as shown in this picture. You will need a new transmission mount. We don’t recommend installing a used transmission mount because it may look in good shape, but that doesn’t mean it is. The rubber will lose elasticity over the years, transmitting the vibration from the transmission to the chassis and the cabin.

Instructions

Replacing the transmission mount on a Mercedes-Benz can be a fairly involved process, so it’s important to have the right tools and follow the correct procedure. Here are the steps you should follow:

1. Safety First: Before beginning any work on your vehicle, make sure it is parked on a level surface, with the engine turned off and the parking brake engaged. Wear appropriate safety gear, such as gloves and eye protection.
2. Raise the vehicle using the jack that came with your car, or even better, use an aluminum jack. Make sure to secure the car by placing jack stands underneath. No, do not work under a car unsupported by jack stands. The other option would be to use vehicle ramps.
3. Access the mount: Locate the transmission mount, typically near the center of the car’s undercarriage, between the transmission and the vehicle’s chassis. Removing the vehicle’s undercarriage shield or other components may be necessary to access the mount.
   
4. Remove the mount: Support the transmission first, before you loosen anything. Put a second jack under the transmission with a wide pad or a block of wood between the jack saddle and the pan, so the load is spread rather than concentrated on one spot. Never let the jack bear directly on the pan. Take up the weight only as far as needed, without lifting the vehicle off its jack stands, and check that the jack is square and nothing can shift before you trust it. With the transmission supported, use a wrench or socket to loosen and then remove the bolts that secure the mount to the transmission and chassis. Once the bolts are out, carefully lift the mount out of its position.
   
5. Inspect the mount: Examine the old mount for signs of damage, such as cracks or excessive wear. If the mount appears damaged or worn, replace it with a new one.
   
6. Install the new mount: Carefully place the new mount into position, aligning the bolt holes with those on the transmission and chassis. Replace the bolts and tighten them to the figures in the torque specifications below rather than by feel.
   
7. Test the new mount: After installing the new mount, start the engine and test the vehicle’s shifting and acceleration to ensure it is functioning properly. Check for mount alignment, correct fastener torque, clearance from nearby components, and abnormal vibration or noise after the vehicle is safely reassembled.
8. Clean up and replace components: Reinstall any removed components to access the mount, such as the undercarriage shield or other parts.

Overall, replacing the transmission mount on a Mercedes-Benz can be a complex process. If you’re uncomfortable doing the work yourself, it’s best to have a qualified mechanic perform the task for you.

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Frequently Asked Questions

What are the symptoms of a failed Engine or Transmission Mount?

A common symptom of a failed transmission mount is vibration in your seat and cabin.

Other symptoms include:

• Excessive engine and transmission movement when changing gears.
• Noise or a thump when you place the engine in gear.
• Vibration at idle or when accelerating.

Before buying parts, confirm the mounts are actually the cause. See how to check for bad engine mounts.

How often should I change the engine or transmission mounts?

The engine and transmission mounts are not part of regular maintenance, meaning they typically don’t need to be checked or replaced regularly. With that said, Mercedes-Benz engine and transmission mounts seem to fail between 80,000 and 120,000 miles. That’s when most owners start experiencing vibrations on the steering wheel, inside the cabin, or on their seat, with the vibrations being the most noticeable when stopped at a light.

Should I replace the engine mounts at the same time as replacing the transmission mount?

If you feel the vibration in your seat, steering wheel, or cabin, replace the two engine mounts and the transmission mount. You may replace the defective one, but the other mounts will not last long if left in place. The engine mounts are a separate job, covered in our guide on how to change the engine mounts.

How long does it take to replace the engine and transmission mounts?

An experienced mechanic should be able to do the job in less than 2 hours. If you do it yourself for the first time, give yourself 4 or 5 hours.

Replacing the transmission mount only can be done in 20 minutes by an experienced mechanic familiar with Mercedes-Benz cars, even though you will most likely get charged for one hour of labor. For a first-time do-it-yourself, it can take up to one hour.

Which brand of Mercedes-Benz motor and transmission mount is best?

Our recommended brand for the motor and transmission mount is LEMFORDER. It is the same brand and OEM part that Mercedes-Benz uses. You can find LEMFORDER motor mounts on Amazonfor much less than what the dealer charges.

Applicable Models and Part Number

Related Part Numbers:

• 220 240 0518
• 212 240 0418
• 209 211 215 220 230
• 2200617 220 240 02 18
• 2202400218
• 2 20 24 00418,2 20 24 00218
• 2 12 24 00418,2 20 24 00518
• AM-2878323111

Verify parts before purchasing. Check against the VIN and its shape against the original part.

These instructions are very similar for the following years and models:

1997-00 Mercedes-Benz C230 2003-05 Mercedes-Benz C240 2001-02 Mercedes-Benz C240 1998-00 Mercedes-Benz C280 2002-04 Mercedes-Benz C32 AMG 2003-05 Mercedes-Benz C320 2001-02 Mercedes-Benz C320 1997 Mercedes-Benz C36 AMG 1998-00 Mercedes-Benz C43 AMG 2005-06 Mercedes-Benz C55 AMG 1998-05 Mercedes-Benz CL500 2001-05 Mercedes-Benz CL55 AMG 1998-05 Mercedes-Benz CL600 2005 Mercedes-BenzCL65 AMG 1998-05 Mercedes-Benz CLK320 2006-09 Mercedes-Benz CLK350 1999-02 Mercedes-Benz CLK430 2003-05 Mercedes-Benz CLK500 2001-05 Mercedes-Benz CLK55 AMG 2007-09 Mercedes-Benz CLK550 1997 Mercedes-Benz E300 1997-09 Mercedes-Benz E320 1997 Mercedes-Benz E420 2000-02 Mercedes-Benz E430

1997-00 Mercedes-Benz C230 2003-05 Mercedes-Benz C240 2001-02 Mercedes-Benz C240 1998-00 Mercedes-Benz C280 2002-04 Mercedes-Benz C32 AMG 2003-05 Mercedes-Benz C320 2001-02 Mercedes-Benz C320 1997 Mercedes-Benz C36 AMG 1998-00 Mercedes-Benz C43 AMG 2005-06 Mercedes-Benz C55 AMG 1998-05 Mercedes-Benz CL500 2001-05 Mercedes-Benz CL55 AMG 1998-05 Mercedes-Benz CL600 2005 Mercedes-BenzCL65 AMG 1998-05 Mercedes-Benz CLK320 2006-09 Mercedes-Benz CLK350 1999-02 Mercedes-Benz CLK430 2003-05 Mercedes-Benz CLK500 2001-05 Mercedes-Benz CLK55 AMG 2007-09 Mercedes-Benz CLK550 1997 Mercedes-Benz E300 1997-09 Mercedes-Benz E320 1997 Mercedes-Benz E420 2000-02 Mercedes-Benz E430

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Torque Specifications

• 16 mm bolts between the transmission and the mount- 35 ft-lb.
• 13 mm bolts between the mount and the support bracket -25 ft-lb.

These figures depend on the model, chassis, transmission and which fastener you are tightening. Verify the torque specifications against the applicable Mercedes-Benz service information, including any replacement-fastener requirements.

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