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Transmission Mount Replacement
 
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Pelican Technical Article:

Transmission Mount Replacement

Steve Vernon

Time:

3 hours3 hrs

Tab:

$25 to $200

Talent:

**

Tools:

16mm, 13mm socket, extension, floor jack, jack stands, wheel chocks, safety glasses, torque wrench

Applicable Models:

Mercedes-Benz C350 (2008-14)
Mercedes-Benz GLK350 (2010-14)

Parts Required:

Transmission mount

Hot Tip:

Put a piece of wood between the jack and transmission

Performance Gain:

Proper drive shaft alignment

Complementary Modification:

Check your flex disks

The transmission mount provides many functions; it holds the transmission in proper alignment with the drive shaft, absorbs some of the drivetrain vibrations and helps transfer the torque to the drive train. The mount is made of metal and rubber. The rubber section does wear out. When this happens the drive train will fall out of alignment and can cause damage to other expensive components.

One of the symptoms of the mount going bad is a sound when getting on or off the gas as the slop in the mount allows the transmission to flex in the mount until it hits the side of it. You can also start hearing and feeling a lot more drive train noise.

If you suspect your mount is going bad safely jack up the car and have a look at it. You can see it clearly without moving any other components. If you feel it is bad place a piece of wood under the transmission, and slowly lift the transmission. If the transmission moves by itself you have a bad mount.

To change the mount you will need to safely raise and support the front of the vehicle. Please see our article on safely raising and supporting your w204.

The transmission mount connects to the cross mount by three 13mm bolts (red arrows).
Figure 1

The transmission mount connects to the cross mount by three 13mm bolts (red arrows). The mount connects to the chassis by six 16mm bolts (yellow arrows).

This image shows the actual mount (red arrow).
Figure 2

This image shows the actual mount (red arrow).

Begin by placing a piece of wood across the transmission to help distribute the load and safely support the weight of the transmission.
Figure 3

Begin by placing a piece of wood across the transmission to help distribute the load and safely support the weight of the transmission.

Next, remove the three 13mm bolts through the access holes (red arrows) in the mount.
Figure 4

Next, remove the three 13mm bolts through the access holes (red arrows) in the mount.

Remove the six 16mm bolts, and remove the cross member.
Figure 5

Remove the six 16mm bolts, and remove the cross member. Use care, as the cross member is heavy.

You can now remove the mount from the transmission by removing the two 16mm bolts (red arrows).
Figure 6

You can now remove the mount from the transmission by removing the two 16mm bolts (red arrows).

With the bolts removed the mount should just fall from the transmission.
Figure 7

With the bolts removed the mount should just fall from the transmission.

This mount is fine but a worn mount would have deteriorated, broken and had missing rubber from the center.
Figure 8

This mount is fine but a worn mount would have deteriorated, broken and had missing rubber from the center. Make sure when installing that you place the crown of the mount on the top so the mounting holes on the bottom face the cross member. Installation is the reverse of removal.

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Page last updated: Mon 3/27/2017 03:03:14 AM