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General E46 Forum
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Old 12-06-2016, 10:17 AM   #1
e46dub
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Join Date: Mar 2012
Location: chicago
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My Ride: 2000 328i
Scrape sound rear end when ACCEL or cruise low Rpm HELP!

Hey guys here's the issue. I noticed it a few days ago that when I would be slowing down while still in gear I could hear a scrape scrape scrape sound really quietly. It's similar to when your brakes are worn out. When I pushed in the clutch the sound went away.

If I accelerate quickly I feel vibration that Wasn't there before. Now I have a 3.46 rear end mated to a 5spd so my rom may differ from common values. But wen accelerating normal not wot, from about 2k to 3000 I get the scrape scrape in 1st and 2nd. Not as noticeable in 3rd. In 3rd or higher gears it's mainly vibration when I ACCEL.

Any idea what this may be?

Also any tips on getting a rear diff poly bushing to sit flush in the holder? Mines seem to migrated a 1/4" to the driver side
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Old 12-07-2016, 12:43 AM   #2
e46dub
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100 views no responses..

climbed under the car and dont see anything visually wrong. of course i didnt have the car jacked up.. just slid underneath.. so pressing the clutch the sound goes away, so i know that it's drivetrain related. What would make a scrape scrape sound and have vibration when I accelerate? The vibration is noticeable in 1st and 2nd, quieter in 3rd..

I recently had all subframe bushings, differential bushings, center bearing, guibo replaced in the last 15k miles. The transmission has also been serviced with a new clutch and flywheel. 3.46 rear end. Tires are brand new, rotors seem just fine (thought it was rotors at first because of the scrape scrape.. was hoping a pebble stuck in the dust shield but no). Usually i'm good at diagnosing the issue but i am at a loss. If anyone has any insight or things I can check please let me know, thank you.


All this happened after I was rear ended at slow speed. Didnt even crack bumper just scuffed it. No visible damage in the spare tire area.

Last edited by e46dub; 12-07-2016 at 12:45 AM.
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Old 12-07-2016, 01:42 AM   #3
Archbid
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Have you checked the heat shields?
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Old 12-07-2016, 03:13 AM   #4
05SMG
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Post video/audio?
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Old 12-07-2016, 07:15 AM   #5
Landlorder
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Centre support bearing failed again ? I changed mine recently with after market and the housing to the csb looks inferior to the oem csb housing - not sure if it will last.
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Old 12-07-2016, 10:39 AM   #6
e46dub
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I will try and get some audio/video. Is a defective CSB easy to spot? I'll check the heat shields but I doubt that would be the cause for vibration. This car sure loves $$$
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Old 12-07-2016, 10:43 AM   #7
UncleShrek
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Wheel bearing? Brake shield bent? Wheel and tire not balanced? Driveshaft not balanced? Exhaust heat shield bent? Subframe not centered? Etc
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Old 12-07-2016, 12:31 PM   #8
e46dub
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Is there a way to get my diff bushing further in its "carrier"? It seem to be in about 1/4" or 1/2" pushed toward the driver side.
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Old 12-07-2016, 12:34 PM   #9
BKMrSteel
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Scrape sound rear end when ACCEL or cruise low Rpm HELP!

Worn differential, does it sound like gear chatter?

Post a picture of the dif bushing
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Last edited by BKMrSteel; 12-07-2016 at 12:36 PM.
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Old 12-07-2016, 01:38 PM   #10
RayPooley
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parking brake shoe spring rusty and snapped???? Items 2 below. shoe rubbing on disc.

http://www.realoem.com/bmw/enUS/show...diagId=34_0768

Last edited by RayPooley; 12-07-2016 at 01:39 PM.
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