6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHWhining Noise on Deceleration - Rear Diff On its way out?
Reported or suspected cause
shaft bearing
Reported cause
No successful repair reported for this finding.
1
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0
Suspected cause
0
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Whining Noise on Deceleration - Rear Diff On its way out?
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Leading evidence: 'shaft bearing' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'shaft bearing' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check especially if you lift the car' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Whining Noise on Deceleration - Rear Diff On its way out?
Inspect rubber boots
Suggestion or failed attempt
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Unsuccessful attempts
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Suggestion
You could ake a look under the car to inspect the rubber boots on the rear axles.
Whining Noise on Deceleration - Rear Diff On its way out?
Replace gear oil every 3 seasons or 15,000
Suggestion or failed attempt
No successful repair reported for this finding.
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0
Unsuccessful attempts
1
Discussions
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Whining Noise on Deceleration - Rear Diff On its way out?
Coverage and how to read this overview
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
This thread came up in a search I was doing and coincidentally enough we just solved the problem so i figured I'd update incase anyone else had this problem.
I've been hearing a whining noise (sounds like some kind of gear noise) on deceleration below 3000RPM.
The noise is not present under any kind of load at all (no matter how light), and is not present above 3000RPM. It also dissapears when the clutch is in.
I don't believe it's the transmission because the synchro's seem fine, car gets into every gear smoothly without grinding or issue.
Off the top of my head i'm thinking it might be:
- Rear differential (car has the factory LSD option that came with the 99's).
- Clutch/flywheel or a bearing related to them? I'm pretty sure the car's had a busted clutch spring since...well...prolly since it rolled off the assembly line.
Any thoughts on the matter? Car still drives flawlessly overall so i'm not particularily concerned...diff's arn't too pricey. A transmission issue though would really hurt the wallet right now =(
Gearing will make noise no matter what. Altering weights of oil change change or make noises disappear. Even if the noise is from a slight play in gearing it doesn't mean its a problem that needs attention right now.
how many miles. Did you have it serviced. I think they changed my gear oil at 90K The below 3K rpm doesnt make any sence. well I guess it can.. The input shaft is always spinning at engine RPM. IM thinking input shaft bearing. To me that would make most sence. Becasue it goes away when you push in the clutch. Thus taking the load off the input shaft.
But I have never had a tranny open. Just looking at the WSM
Maybe work service manual for WSM.
You could ake a look under the car to inspect the rubber boots on the rear axles. The cvc boots if they have cracks or are ripped open can cause degrading of the lube back here giving rise to noises. Its an easy check especially if you lift the car.
This thread came up in a search I was doing and coincidentally enough we just solved the problem so i figured I'd update incase anyone else had this problem.
It was the shaft bearing. The porsche part (thru porsche canada at least) is stupid expensive for what it is, you might want to consider having your mechanic go to a bearing place and putting in a non-porsche part of same design.
This is a source reference. Confirm exact model applicability in the original material.
