E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 12-10-2012, 09:41 AM   #1
Slapsys
Registered User
 
Join Date: Jun 2011
Location: Calgary, Alberta, Canada
Posts: 326
My Ride: 323Ci
Question Loud hum from rear

Ive lately noticed a loud hum from the rear of my 2000 323 Ci. I'd like to think it's just road noise from my winter tires, since it wasn't that loud with my summers on. I looked up some info from this forum wrt rear diff noise and I think I'm ok but I'd like to have a plan be if I'm wrong.
My question is " Can I swap out a rear diff from an M3 and if so, what years are compatible with a 2000 E46?"
Slapsys is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 12-10-2012, 10:05 AM   #2
choxor
Registered User
 
Join Date: Nov 2010
Location: Atlanta, GA
Posts: 4,497
My Ride: JDM
Search. M3 diff swap is well documented. You're going to need a lot more than the diff to get it to work.
__________________
choxor is offline   Reply With Quote
Old 12-10-2012, 10:10 AM   #3
wamcdonald
Registered User
 
Join Date: Jul 2010
Location: Phoenix, AZ
Posts: 24
My Ride: 2002 330Ci
All jokes about noises coming from your rear end aside....I had this same problem on a 2000 323 Ci also. The mileage was around 150K and it ended up being one of the rear wheel bearings.

Last edited by wamcdonald; 12-10-2012 at 10:12 AM.
wamcdonald is offline   Reply With Quote
Old 12-10-2012, 10:21 AM   #4
Cees
Registered User
 
Join Date: Dec 2012
Location: NJ
Posts: 15
My Ride: 323ci
Simplest way to find out; Jack/Lift the car up securely on both rears and inspect the vehicle in motion with a partner.
__________________

Last edited by Cees; 12-10-2012 at 10:21 AM.
Cees is offline   Reply With Quote
Old 12-10-2012, 11:25 AM   #5
Slapsys
Registered User
 
Join Date: Jun 2011
Location: Calgary, Alberta, Canada
Posts: 326
My Ride: 323Ci
Thanks for the advice. I'll look into the wheel bearing as a possible. The jacking up and letting 'er spin gives me the shudders. Haven't you seen Ferris Beuler's Day Off?
As far as the "Search" advice: It took you longer to type that than a simple yes or no.
Slapsys is offline   Reply With Quote
Old 12-10-2012, 12:31 PM   #6
wamcdonald
Registered User
 
Join Date: Jul 2010
Location: Phoenix, AZ
Posts: 24
My Ride: 2002 330Ci
When I did my wheel bearing it was the drive's side and it was a 8!tch, I had to remove the trailing arm and take it to a shop to have the half shaft pressed out. I also did the passenger side and it was easy and did not require removal of the trailing arm. Be careful then pressing in the bearings...you can press the middle out of the bearing and ruin it.....yes it happened to me. Also....do the fronts too. You have to buy a new hub with bearing for that one.

Last edited by wamcdonald; 12-13-2012 at 09:29 AM.
wamcdonald is offline   Reply With Quote
Old 12-10-2012, 05:45 PM   #7
HerbicidE46
Registered User
 
Join Date: Mar 2011
Location: Tampa, Florida
Posts: 52
My Ride: 2000 323i
If the sound gets louder as you accelerate and lower as you slow down its most likely your wheel bearings, I had the same problem and new ones took care of the noise, my 2 cents...
HerbicidE46 is offline   Reply With Quote
Old 12-10-2012, 06:29 PM   #8
willsbma
Registered User
 
Join Date: Jul 2006
Location: north babylon NY
Posts: 2,531
My Ride: 99 323i
I diagnosed a bad wheel bearing by doing a slalom while driving. Try to see if you can make it better or worse by swerving wide while doing about 30mph. If the noise goes away or gets worse when going a certain direction you are one step closer to a solution. GL
__________________
Matte Black Kidney Grilles | Smoked Tails & Corners | Mtech II Bumper | Hotchkis Springs | ACS Roof Spoiler | M3 Spoiler | 20% Tint
WTB: Black sun visors & grab handles - PM ME!

I have P.A. Soft and a 20-pin adapter. Only used it a few times but pm me if you need anything coded!
willsbma is offline   Reply With Quote
Old 12-11-2012, 10:07 AM   #9
Slapsys
Registered User
 
Join Date: Jun 2011
Location: Calgary, Alberta, Canada
Posts: 326
My Ride: 323Ci
Quote:
Originally Posted by HerbicidE46 View Post
If the sound gets louder as you accelerate and lower as you slow down its most likely your wheel bearings, I had the same problem and new ones took care of the noise, my 2 cents...
The loudness is constant. Just the pitch changes (Goes higher and lower) as I accelerate or slow down. That's why I'm thinking (read hoping) it's the snow tires.
Slapsys is offline   Reply With Quote
Old 12-11-2012, 10:09 AM   #10
Slapsys
Registered User
 
Join Date: Jun 2011
Location: Calgary, Alberta, Canada
Posts: 326
My Ride: 323Ci
Quote:
Originally Posted by willsbma View Post
I diagnosed a bad wheel bearing by doing a slalom while driving. Try to see if you can make it better or worse by swerving wide while doing about 30mph. If the noise goes away or gets worse when going a certain direction you are one step closer to a solution. GL
Good idea but in the snow, I'm pretty much hooped. parking lots are packed snow around here for much of the winter.
Slapsys is offline   Reply With Quote
Old 12-11-2012, 05:46 PM   #11
willsbma
Registered User
 
Join Date: Jul 2006
Location: north babylon NY
Posts: 2,531
My Ride: 99 323i
Didn't realize you were snowed in, sorry. Id just jack up each wheel and see which one is wobbly or sounds funny

Sent from my DROIDX using Bimmer App
__________________
Matte Black Kidney Grilles | Smoked Tails & Corners | Mtech II Bumper | Hotchkis Springs | ACS Roof Spoiler | M3 Spoiler | 20% Tint
WTB: Black sun visors & grab handles - PM ME!

I have P.A. Soft and a 20-pin adapter. Only used it a few times but pm me if you need anything coded!
willsbma is offline   Reply With Quote
Old 12-11-2012, 06:13 PM   #12
Zell
Registered User
 
Zell's Avatar
 
Join Date: Jun 2009
Location: wow such city
Posts: 5,751
My Ride: Has no throttle
Prob wheel bearing, at 50 and 74 mph I can hear a definite hum from the rear. Gonna replace it at some point when I get the tools to do it. I don't have a good torque wrench or breaker bar or anything.
__________________
Zell is offline   Reply With Quote
Old 12-12-2012, 10:16 AM   #13
Slapsys
Registered User
 
Join Date: Jun 2011
Location: Calgary, Alberta, Canada
Posts: 326
My Ride: 323Ci
What would it cost (including parts) to have an indi fix it?
Slapsys is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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 On
Censor is ON





All times are GMT -5. The time now is 04:06 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use