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BMW Transmission Mount Replacement
 
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Pelican Technical Article:

BMW Transmission Mount Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$

Talent:

****

Tools:

Set of sockets, 13mm, floor jack, wood blocks, 13mm wrench

Applicable Models:

BMW 325i Sedan (2006)
BMW 325xi Sedan/Wagon (2006)
BMW 328i xDrive Coupe (2009-13)
BMW 328i xDrive Sedan (2009-11)
BMW 328i xDrive Wagon (2009-12)
BMW 328i/xi Coupe (2007-13)
BMW 328i/xi Sedan (2007-11)
BMW 328i/xi Wagon (2007-12)
BMW 330i/xi Sedan (2006)
BMW 335d/i/xi Sedan (2007-11)
BMW 335i xDrive Coupe (2009-13)
BMW 335i xDrive Sedan (2009-11)
BMW 335i/is/xi Coupe (2007-13)

Parts Required:

Transmission mounts, nuts for the mounts

Hot Tip:

Replace in sets

Performance Gain:

Smooth driveline

Complementary Modification:

Replace driveshaft flex-disc at the same time

The transmission has two small rubber mounts that insulate it from the aluminum support bracket. These mounts wear over time and cause a driveline vibration. Sometimes if they fail catastrophically, there will be a clunk when accelerating. When inspecting the mounts, look for dry rot and cracking. You can check to see if they have separated by jacking the transmission (as described later), as you jack the transmission, monitor the mounts, they should stretch a little but stay in one piece. When replacing the mounts, I'd suggest replacing the nuts also. You are not required too, but I always feel better about have a new fastener, especially on something that takes as much stress as a mount. It's also not a bad idea to replace your driveshaft flex-disc at the same time. It is also made of rubber and if the mounts are worn out, the flex-disc can't be far behind.

In this article, I'll go over the steps involved with replacing the transmission mounts.

The two rubber mounts are the same part number, located between the transmission and the aluminum support bracket.
Figure 1

The two rubber mounts are the same part number, located between the transmission and the aluminum support bracket. (green arrows) Raise and support rear of vehicle on jack stands. See our tech article on jacking up your vehicle. Working below transmission, remove transmission splash shield. See our tech article on lower splash shield replacing.

Working at bottom of transmission support bracket, remove two 13mm transmission mount fasteners.
Figure 2

Working at bottom of transmission support bracket, remove two 13mm transmission mount fasteners. (green arrows)

Next, you will have to loosen the top nuts on the transmission mounts.
Figure 3

Next, you will have to loosen the top nuts on the transmission mounts. (green arrows) Use a 13mm wrench and break them free.

Then loosen the nuts about 6 turns, this will give you enough room to remove them when it is time.
Figure 4

Then loosen the nuts about 6 turns, this will give you enough room to remove them when it is time. (green arrows)

Place a floor jack under the transmission.
Figure 5

Place a floor jack under the transmission. Use a few woods blocks to protect the transmission from damage. Once the jack and wood blocks are in place, jack the transmission slightly, just enough to remove the weight from the support bracket.

Now it's time to remove the support bracket fasteners.
Figure 6

Now it's time to remove the support bracket fasteners. (green arrows) Using a 13mm socket, remove all four fasteners. Then remove the support bracket from the transmission.

With the support bracket out of the way, you can remove the transmission mounts.
Figure 7

With the support bracket out of the way, you can remove the transmission mounts.

When installing the new mounts, be sure the tab on the mount aligns with slot in the transmission.
Figure 8

When installing the new mounts, be sure the tab on the mount aligns with slot in the transmission. (green arrows) Install the new mounts to the transmission and install the nuts finger tight. Attach the support bracket next and tighten the fasteners. Then lower the transmission and install the lower mount nuts. Then, tighten all of the fasteners for the transmission mounts. Assemble the remaining items in the reverse order of removal.

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Comments and Suggestions:
Brandon Comments: I have 2006 E90 330i manual.
Tere is vibration/rattle at 20mph after about 25-30mph it runs normal without any vibration or rattle. wehen applying the break at about 40mph the steering wheel starts so vibrate . Any ideas would be helpful.
March 15, 2017
  Followup from the Pelican Staff: Brake rotors, control arm bushings, worn control arm ball joints, worn tie rods, or shock absorbers are the likely culprits - Casey at Pelican Parts  
Cesar Comments: Hi, I own a 2007 328xi sedan Auto. If I wanted to replace all mounts and bolts, could you list out how many and which parts I will need.
August 2, 2016
  Followup from the Pelican Staff: I’m not the best with part numbers.

Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
zdreman Comments: I have a 2007 323i similar to 328i in the U.S. my car is clunking when coming to a complete stop, it also shifts hard sometimes between gears. Some days it is more appearant than others. Would transmission mounts be beneficial to change? What else could it be. There are no codes for transmission, just changed the fluid. Automatic
May 12, 2015
  Followup from the Pelican Staff: Check if the mounts are moving too much, creating the clunk. You can watch engine transmission motion under torque or inspect the mounts with the vehicle raised and the engine off. Look for broken or torn mounts. - Nick at Pelican Parts  
Vitaly Comments: When I give my 2007 328i some gas, and RPMs go over 2k, the engine shakes really bad. It's a manual, if that makes a difference. And if it is the mounts, how do I know if it's engine mounts or transmission mounts?
April 22, 2015
  Followup from the Pelican Staff: Look for leaks or broken mounts, excessive movement is also a sign of faulty mounts. - Nick at Pelican Parts  
dirk Comments: Ive got a thud/jerking when accelerating fron a stop, or downshift when accelerating out of turns. Some times D symbol disappears when this happens, or changes to DS mode from manual then back.
March 5, 2015
  Followup from the Pelican Staff: First check the transmission fluid level to be sure it is correct. This could be a driveline item or a faulty bushing in the transmission. I would inspect the mounts and shift linkage first.


Then check the transmission ECM for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.
- Nick at Pelican Parts
 
Tony Comments: 2007 335xi? I take it this one is different and not applicable to this model?
October 23, 2014
  Followup from the Pelican Staff: Your is different. You have the mount style in this tech article:
http://www.pelicanparts.com/BMW/techarticles/BMW-3-Series-E90/TRANS-Transfer_Case_Fluid_Replacing/TRANS-Transfer_Case_Fluid_Replacing.htm

Once the bracket is removed, the mount is pressed in using a special tool.

SImilar tyo E46 models here:

http://www.pelicanparts.com/BMW/techarticles/BMW-3-Series-E90/TRANS-Transfer_Case_Fluid_Replacing/TRANS-Transfer_Case_Fluid_Replacing.htm

I am working on getting an article together for E90 models as well. - Nick at Pelican Parts
 

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Page last updated: Mon 9/25/2017 02:25:16 AM