E90Post
 


ECS BMW
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > All-Wheel-Drive (Xi / xDrive) Talk > Driveline/Chassis Slop



Reply
 
Thread Tools Search this Thread
      04-05-2020, 09:33 PM   #1
SAVAGE_VT_E92
Private
12
Rep
51
Posts

Drives: ‘07 328xi Coupe
Join Date: Mar 2020
Location: Vermont

iTrader: (0)

Garage List
07 BMW 328xi  [0.00]
Driveline/Chassis Slop

My new-to-me ‘07 328xi has some slop in the driveline that is causing clunky shifts, particularly in lower gears and when hitting the gas at speed. I was thinking of looking into the following parts as possible culprits but was wondering if anyone has experience tracking down similar symptoms:

Guibo
Motor/trans mounts
Diff mounts/bushings
Transfer case mounts/bushings
Rear subframe bushings

I’ve seen a lot of discussion of rear subframe bushing failure on this forum and was wondering if anyone had used these or knows how they compare to power flex inserts?

Anything else I should consider?
Appreciate 0
      04-06-2020, 10:11 PM   #2
wuoltk
Private
wuoltk's Avatar
Germany
12
Rep
63
Posts

Drives: Alpine White 2008 e92 335xi
Join Date: Oct 2013
Location: Arzfeld, Germany

iTrader: (0)

Garage List
2008 BMW 335xi  [0.00]
Check the center carrier bearing also
Appreciate 1
      04-06-2020, 10:49 PM   #3
SAVAGE_VT_E92
Private
12
Rep
51
Posts

Drives: ‘07 328xi Coupe
Join Date: Mar 2020
Location: Vermont

iTrader: (0)

Garage List
07 BMW 328xi  [0.00]
Quote:
Originally Posted by wuoltk View Post
Check the center carrier bearing also
Good call.
Appreciate 0
      04-07-2020, 08:51 AM   #4
matteblue3er
Captain
192
Rep
879
Posts

Drives: Racecar
Join Date: Jul 2015
Location: Philly

iTrader: (0)

I just replaced my motor mounts and shifting is night and day.

I just did a manual trans swap and after doing so, power delivery felt as if I was using a rubber band between the trans and engine. After doing mounts, power delivery is solid. Had 131k on the drivers, passenger which takes more load was replaced around 80k miles. Both were stiff when I took them out so at first; I thought it wasn't going to make a difference but it completely solved that disconnected feeling I was getting.

I used 034 Motorsport 50A mounts. FWIW, I also have a solid aluminum transfer case mount.

I've never used those 034 motorsport subframe inserts but in theory, they should be better than those poly inserts you see. These seem to lockdown the inner metal section with the rest of the subframe/chassis. Similar to how my transfer case mount by Twisted Tuning works.

Btw xDrive models do not have trans mounts. There is only the transfer case mount
Appreciate 1
      04-07-2020, 12:15 PM   #5
SAVAGE_VT_E92
Private
12
Rep
51
Posts

Drives: ‘07 328xi Coupe
Join Date: Mar 2020
Location: Vermont

iTrader: (0)

Garage List
07 BMW 328xi  [0.00]
Quote:
Originally Posted by matteblue3er View Post
I just replaced my motor mounts and shifting is night and day.

I just did a manual trans swap and after doing so, power delivery felt as if I was using a rubber band between the trans and engine. After doing mounts, power delivery is solid. Had 131k on the drivers, passenger which takes more load was replaced around 80k miles. Both were stiff when I took them out so at first; I thought it wasn't going to make a difference but it completely solved that disconnected feeling I was getting.

I used 034 Motorsport 50A mounts. FWIW, I also have a solid aluminum transfer case mount.

I've never used those 034 motorsport subframe inserts but in theory, they should be better than those poly inserts you see. These seem to lockdown the inner metal section with the rest of the subframe/chassis. Similar to how my transfer case mount by Twisted Tuning works.

Btw xDrive models do not have trans mounts. There is only the transfer case mount
Thanks for that input. I'll see if I can visually check the motor mounts by revving up while holding the e-brake and will judge the motion there. I'm thinking that its more likely to be the transfer case mount (thanks for the tip on the xi not having trans mounts) or the subframe just based on where I feel the clunk but definitely won't rule out the motor mounts.

Did you notice any increased NVH with the harder mounts or solid t-case mount?
Appreciate 0
      04-08-2020, 08:26 AM   #6
matteblue3er
Captain
192
Rep
879
Posts

Drives: Racecar
Join Date: Jul 2015
Location: Philly

iTrader: (0)

Quote:
Originally Posted by SAVAGE_VT_E92 View Post
Thanks for that input. I'll see if I can visually check the motor mounts by revving up while holding the e-brake and will judge the motion there. I'm thinking that its more likely to be the transfer case mount (thanks for the tip on the xi not having trans mounts) or the subframe just based on where I feel the clunk but definitely won't rule out the motor mounts.

Did you notice any increased NVH with the harder mounts or solid t-case mount?
Motor mounts, no. Replacing my mounts actually decreased vibration at idle.

Transfer case mount, yes. There is increased vibration at idle. My E90 is not a daily driver so I don't mind
Appreciate 0
      05-08-2020, 09:47 PM   #7
SAVAGE_VT_E92
Private
12
Rep
51
Posts

Drives: ‘07 328xi Coupe
Join Date: Mar 2020
Location: Vermont

iTrader: (0)

Garage List
07 BMW 328xi  [0.00]
So I ended up installing whiteline RFSB inserts and they definitely took the edge off of the clunky shifts but they are not completely. Based on where I feel the clunks I’m thinking more that this is related to the guibo or t-case mount vs the motor mounts. I’m now debating whether this job is worth the $600 or so my local shop is quoting to do the work... if I had to start with one of the two, which would make more sense? Is that quote crazy?
Appreciate 0
      05-09-2020, 01:55 PM   #8
Boosted12a
Private First Class
42
Rep
145
Posts

Drives: BMW 335i x
Join Date: Jun 2019
Location: Va

iTrader: (0)

Yes, expensive. You can get the tools you need and parts for less than that.
Appreciate 0
      05-09-2020, 03:27 PM   #9
SAVAGE_VT_E92
Private
12
Rep
51
Posts

Drives: ‘07 328xi Coupe
Join Date: Mar 2020
Location: Vermont

iTrader: (0)

Garage List
07 BMW 328xi  [0.00]
Quote:
Originally Posted by Boosted12a View Post
Yes, expensive. You can get the tools you need and parts for less than that.
Yeah I wouldn’t hesitate to do these myself but I don’t have a great setup for getting under the car. I think I would need some taller jack stands and a more serious floor jack than what I’m working with now to get in there. Or a quickjack...
Appreciate 0
      05-09-2020, 09:46 PM   #10
Boosted12a
Private First Class
42
Rep
145
Posts

Drives: BMW 335i x
Join Date: Jun 2019
Location: Va

iTrader: (0)

Once you have the tools they will pay for themselves quickly. Has your water pump been replaced yet? You will save yourself about $500 doing it yourself when it goes. $200 for a good Jack and $35 for stands. They will last decades even if you abuse them.
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 11:02 PM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST