Thud when changin gear - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 10-30-2005, 09:37 AM
n00b
 
Join Date: Oct 2005
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
bmw325ise is on a distinguished road
(Thread Starter)
Thud when changin gear

Hi Guys,

Hi have what seems to be the infamous thud noise when changing into 1st , 2nd and reverse. The loud thud comes from the rear of the car.

I have read many posts on forums on the internet that suggest the following:

1) Guibo, Flex Disc or Prop shaft Coupling or whatever you want to call it maybe worn, in my case it was worn, I had it replaced, still the noise persists.
2) Others have suggested to change the transmission fluid, I have done this as well and the noise is still there.
3) One of the most drastic outcomes of this maybe the fact that the rear sub frame has been ripped away from the car… I checked this, had a stealer check this and we both came to the same conclusion, nothing wrong with the sub frame.
4) I have also changed the Differential fluid.

Does anybody know what this actually could be? I have tested and checked all of obvious and now beginning to run out of ideas, I’m sure this is affecting the performance of the car.

If I hold my foot on the clutch for say 5-10 seconds before engaging the gears, all is well, no thud, this suggests to me a clutch issue, but I am no mechanic. I’m looking to the pro’s of this forum to give me some help, any help would be much appreciated.

Thank-you

Andy

BMW 325i SE 1991 (E36)
bmw325ise is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 10-30-2005, 10:21 AM
2nd Gear Member
 
Join Date: Sep 2004
Posts: 358
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
bad man working is an unknown quantity at this point
Check all the mounts engine, gearbox, diff, suspension and the centre diff I’ve never heard a clutch knock
bad man working is offline  
#3 (permalink) Old 10-30-2005, 10:28 AM
Threadkiller
 
bitcore's Avatar
 
Join Date: Jan 2004
Location: High Point, NC
Posts: 2,907
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
bitcore will become famous soon enough bitcore will become famous soon enough
I believe new tranny mounts could help, probably wont cure it but the thud is due to slack in the driveline and the tranny mounts are notorious for being weakend and allowing the transmission to twist under load. (which = a money shift if you shift and the transmission is still torquin)
My rear subframe is loose, but not torn. Since I have an automatic with a weak engine, and a late model chassis it's not so much of a concern with me, but eventually it will wiggle itself to pieces.


Put the E-brake on HAAARD, chock the wheels like a motherfucker, and get someone you trust with your life to put the car in a gear that it makes the thud (preferably 1st gear!) and feather the clutch or whatever you do that makes it thud. You go behind it and look under the car and watch the rear driveline when the friend puts it in gear.
Better yet would be to get a webcam, some USB extension cables, and duct tape a webcam under the rear of the car, looking at the subframe. Be sure to use software that RECORDS so you arn't driving around watchin it! This is what I did and mine rotates a whole lot up and down (on the axis of the rear wheels instead of the driveaxle) according to the torque being applied to it... That disturbed the shit out of me but I can't see anything BROKEN about it other than the bushings are worn to hell or some bolt is loose.....

I should post some videos.



Last edited by bitcore; 10-30-2005 at 10:34 AM.
bitcore is offline  
#4 (permalink) Old 10-31-2005, 04:46 PM
General Chaos
 
SpeedInfusion's Avatar
 
Join Date: Dec 2003
Location: Plano, TX
Posts: 13,803
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
SpeedInfusion has disabled reputation
Send a message via AIM to SpeedInfusion
bitcore ur subframe is lose? is that fixable, i hear crazy thumping sounds from my rear latley, check diff bolt, wasnt it, im afraid of it being the subframe, i hope i can still add the reenforcements before its too late...

SpeedInfusion is offline  
#5 (permalink) Old 11-01-2005, 06:31 PM
Threadkiller
 
bitcore's Avatar
 
Join Date: Jan 2004
Location: High Point, NC
Posts: 2,907
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
bitcore will become famous soon enough bitcore will become famous soon enough
Something back there is loose as hell... I know it.


bitcore is offline  
#6 (permalink) Old 11-01-2005, 07:06 PM
Been here a while.
 
97alpineM3's Avatar
 
Join Date: May 2004
Location: Virginia
Posts: 5,375
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
97alpineM3 is a name known to all 97alpineM3 is a name known to all 97alpineM3 is a name known to all 97alpineM3 is a name known to all 97alpineM3 is a name known to all 97alpineM3 is a name known to all
Send a message via AIM to 97alpineM3 Send a message via MSN to 97alpineM3
Have you checked the jack next to the spare?... or the battery?

Les


1997 E36 M3 1990 E30 325i
97alpineM3 is offline  
#7 (permalink) Old 11-01-2005, 09:50 PM
General Chaos
 
SpeedInfusion's Avatar
 
Join Date: Dec 2003
Location: Plano, TX
Posts: 13,803
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
SpeedInfusion has disabled reputation
Send a message via AIM to SpeedInfusion
bitcore have ur frame checked out...

SpeedInfusion is offline  
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 3-Series (E36)


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Gear Popping rick316i 3-Series (E36) 2 08-17-2004 03:37 PM
SMG questions... chuckie789 3-Series (E46, E90) 7 08-06-2004 11:55 AM

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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome