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Differential Mount or Bushing Replacement
 
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Pelican Technical Article:

Differential Mount or Bushing Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$40 to $220

Talent:

**

Tools:

22mm, 13mm socket

Applicable Models:

Mercedes-Benz W123 (1977-85)

Parts Required:

Mount

Hot Tip:

Clean around the differential before you start

Performance Gain:

Smoother drive train operation

Complementary Modification:

Check your CV joints

Like any mount; i.e., transmission or engine, that connects a section of the drive train to the chassis, it will wear out over time. These mounts are usually made out of several compounds but one is usually a rubber type and they just plain wear out, rip, tear or degrade. If you are getting sounds from the rear of your vehicle while accelerating, going around corners or a bump or when you take your foot off the throttle, it's time to check and perhaps replace the differential mount or bushing. You do not need to drain the differential while performing this work but if you don't know when the last time the fluid was changed, this is also a good time to perform that work. Please see our article on how to change your differential fluid for additional instructions.

You will need to safely lift and support the rear end of your W123, please see our article on raising and supporting your vehicle.

The mount attaches to the rear of the differential housing (red arrow) and can easily be inspected for any tears or degradation.
Figure 1

The mount attaches to the rear of the differential housing (red arrow) and can easily be inspected for any tears or degradation.

If your vehicle is equipped with the self-leveling suspension, the leveling unit is just behind and to the left of the differential.
Figure 2

If your vehicle is equipped with the self-leveling suspension, the leveling unit is just behind and to the left of the differential. You can replace the mount without having to move the leveling unit (red arrow).

Begin by using a floor jack to safely support the weight of the differential and then slightly raise it up taking the weight off the mount (red arrow).
Figure 3

Begin by using a floor jack to safely support the weight of the differential and then slightly raise it up taking the weight off the mount (red arrow). Note: Our fill plug is out because we are changing the fluid but you do not need to do this unless you are replacing the fluid as well.

With the weight on the jack, use a 22mm socket and remove the two bolts (red arrow).
Figure 4

With the weight on the jack, use a 22mm socket and remove the two bolts (red arrow). Up sway bar may be a little in the way of the upper bolt but it is flexible enough to fit the socket on the bolt.

Remove the two 13mm bolts holding the mount to the frame (red arrows).
Figure 5

Remove the two 13mm bolts holding the mount to the frame (red arrows). Installation is the reverse of removal and you may have to slightly raise or lower the jack to get everything to line up.

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Page last updated: Tue 6/27/2017 03:13:19 AM