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YOUR RESEARCHHowl from somewhere on lifting off throttle
Leading reported evidence
Replace gearbox oil it was
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Doesn't happen under load, and when I changed the gearbox oil it was clean and free of any particles.
Leading evidence: 'Replace gearbox oil it was' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace gearbox oil it was' (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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Suggestion
These gearboxes have a fairly common problem where a worn pinion bearing in the gearbox causes a whine on the over run, do hope it's not that!
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911uk: 1 discussions
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This may just be a normal sound for 996.1 , but I haven’t driven any others so don’t know!
There is a whining/howling from somewhere when the car is off load (lifting off throttle or coasting down hill etc). Disappears when I accelerate. Not there during idling.
It sounds like it’s coming from the front but I can’t be sure. There is brand new oil in the gearbox and it’s a C2
Where should I start with diagnosing, or is it just a 996 foible?
Don't lift off simples
These gearboxes have a fairly common problem where a worn pinion bearing in the gearbox causes a whine on the over run, do hope it's not that!
So I gave it a bit of a listen whilst driving today. The noise diminishes quite a lot if I press the clutch whilst coasting, and also about the same if I blip the throttle whilst coasting. The noise is still just about there, but very much quieter. It seems to get quieter as the car warms up too.
So it sounds like the noise is coming from the gearbox when a reverse load (from your wheels) is applied to it. Personally I'm of the opinion that noise is there on everybody's but for some reason with your's it's more pronounced. Hence why I asked at the beginning if you had powerflex gear mount inserts in as they are known to enhance the NVH. Could also be some mechanical noise in the gearbox that's louder when colder......jury's out.
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