Whine from rear end
02-07-2008, 02:55 AM
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I noticed a high frequency whine coming from the rear of my 04 5 series. 47K miles at interstate speed 70mph. It is not loud but once I tuned into it it became a bother. If I let off the gas it would stop. But as soon as I apply gas to keep it at 70 it came back.
Is this cpmmon? does it mean there is a problem?
Is this cpmmon? does it mean there is a problem?
02-07-2008, 11:22 AM
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Originally Posted by meatzorb' post='528327' date='Feb 7 2008, 03:55 AM
I noticed a high frequency whine coming from the rear of my 04 5 series. 47K miles at interstate speed 70mph. It is not loud but once I tuned into it it became a bother. If I let off the gas it would stop. But as soon as I apply gas to keep it at 70 it came back.
Is this cpmmon? does it mean there is a problem?
Is this cpmmon? does it mean there is a problem?
Have the rear end checked by a professional. Hopefully its nothing serious, but the noise appears with the application of power. When coasting, the input (drive) shaft places very little load on the carrier. The differential will function as normal. However, the application of power places load on the carrier (and planetary gear sets). The differential then has to both perform its function of allowing independant wheel rotation speeds AND act to distrubute power. Fluid loss, gear misalignment, bearing failure, or gear friction can cause various noises, including the whine. 47k and you're still warranted. 50K and you're SOL without an extended warranty if major repairs are needed. Good luck - let us know how it turns out.
02-07-2008, 11:48 AM
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Originally Posted by advancedlogic' post='528521' date='Feb 7 2008, 03:22 PM
Have the rear end checked by a professional. Hopefully its nothing serious, but the noise appears with the application of power. When coasting, the input (drive) shaft places very little load on the carrier. The differential will function as normal. However, the application of power places load on the carrier (and planetary gear sets). The differential then has to both perform its function of allowing independant wheel rotation speeds AND act to distrubute power. Fluid loss, gear misalignment, bearing failure, or gear friction can cause various noises, including the whine. 47k and you're still warranted. 50K and you're SOL without an extended warranty if major repairs are needed. Good luck - let us know how it turns out.
02-07-2008, 01:03 PM
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Originally Posted by meatzorb' post='528327' date='Feb 7 2008, 03:55 AM
I noticed a high frequency whine coming from the rear
Perhaps some Beano would help??
02-07-2008, 02:44 PM
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Originally Posted by meatzorb' post='528327' date='Feb 7 2008, 11:55 AM
I noticed a high frequency whine coming from the rear of my 04 5 series.
On a more serious note, if your diff is whining get it into the shop asap before it goes bang
02-07-2008, 03:14 PM
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My Ride: 04 545i - Titanium Silver/Black, Sport pkg, Comfort Seats w/ Lumbar, Premium Sound, power rear sunshade, Adaptive Xenon Headlights, Steptronic, Park Distance Control, Fold down rear seats w/ski bag, Aux jack, 6-disk changer, puddle lamps...
Engine: Custom Remus cat-back exhaust w/chrome square tips, K&N Air Filter, Charcoal Filter Removed, Sprint Booster :-), 50/50 mix of 91+100 Octane, EuroRev ECU Remap (coming soon lol), Dinan High-Flow Throttle Body (coming soon...maybe lol)
Interior: Portable Sirius Stilletto 100 w/car kit, Garmin Nuvi 680 mounted below rear-view mirror, LCI-style I-drive knob, Dark Poplar Center Dashboard Trim.
Exterior: E60 forum clings, 5% rear tint, ACS roof spoiler (painted black for distinct look against limo tint), ACS trunk spoiler, ACS add-on front spoiler and rear apron (awaiting installation), "18 Black Staggered BeBeS Style OER (emergency replacement for cracked sport 124 rims), black kidney grill, white accessory lighting (including license and trunk lamps), Angel-eye upgrade, AIB xenon-matched fog lamps, AIB V3's on order, red rear reflectors
Originally Posted by pukka' post='528526' date='Feb 7 2008, 12:48 PM
There are no bearings in a differential.
Let me clarify - WHEEL bearing, output shaft bearing (which, in fact, IS attached to the differential - 
), carrier bearing, etc...
02-07-2008, 03:16 PM
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Originally Posted by meatzorb' post='528327' date='Feb 7 2008, 03:55 AM
I noticed a high frequency whine coming from the rear of my 04 5 series. 47K miles at interstate speed 70mph. It is not loud but once I tuned into it it became a bother. If I let off the gas it would stop. But as soon as I apply gas to keep it at 70 it came back.
Is this cpmmon? does it mean there is a problem?
Is this cpmmon? does it mean there is a problem?
I have thought about mentioning it when I have the car seviced but I have alway forgotten. I may try to remember to mention it while the car isstill under warranty just to make sure, but it is very very slight. Good luck with whatever you decide to do, and welcome to the forum.
02-08-2008, 02:57 AM
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My Ride: 2008 535i:
(8/07 Build) Metallic Bronze, Beige NASCA Leather, Ventilated Seats, Sport Pkg, Cold Wxr Pkg, Logic-7 Sound, HUD, Night Vision, PDC, Split Rear Seats, NAV, Premium Pkg, Comfort Access, HD Radio, Sport Auto Trans
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1992 Camaro RS:
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Originally Posted by advancedlogic' post='528629' date='Feb 7 2008, 08:14 PM
Sigh... Let me clarify - WHEEL bearing, output shaft bearing (which, in fact, IS attached to the differential - ), carrier bearing, etc...
Let me clarify - WHEEL bearing, output shaft bearing (which, in fact, IS attached to the differential - ), carrier bearing, etc...I've never dissected a BMW rear diff assy before, but I have done it on Ford's and Chevy's. I'll bet when you open it up the DIFFERENTIAL inside will look something like this:
http://en.wikipedia.org/wiki/Differential_...nical_device%29
or this:
http://auto.howstuffworks.com/differential4.htm
I've never seen any bearings here.
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02-08-2008, 03:17 AM
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My Ride: 2008 535i:
(8/07 Build) Metallic Bronze, Beige NASCA Leather, Ventilated Seats, Sport Pkg, Cold Wxr Pkg, Logic-7 Sound, HUD, Night Vision, PDC, Split Rear Seats, NAV, Premium Pkg, Comfort Access, HD Radio, Sport Auto Trans
Current mods: M-Aero Kit, JB4, Motorcepts 6000k HID Foglamps
Umnitza ICE-Lite 10w LED 6000k AE's
1992 Camaro RS:
Fully Restored w/Custom Interior, 5.0L V8, T-tops, OEM Z28 Foglamps, Inst Cluster, & Spoiler, Custom Sound, Too many engine mods to list
Originally Posted by ImolaRedM' post='528586' date='Feb 7 2008, 06:34 PM
Are you sure? 
You?