7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHSlight Clunk on/off gas pedal at low speeds 30-50km/h
Reported or suspected cause
transmission mount bushings
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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Discussions that report identifying a cause
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported cause
The noise was caused by the transmission mount bushings that had severely deteriorated.
Slight Clunk on/off gas pedal at low speeds 30-50km/h
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Leading evidence: 'transmission mount bushings' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'transmission mount bushings' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check engine mounts - solid, transmission mount look good too' (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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Check engine mounts - solid, transmission mount look good too
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
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Performed · outcome unconfirmed · Original poster
Had a chance to lift the car, and checked the engine mounts - solid, transmission mount look good too.
Slight Clunk on/off gas pedal at low speeds 30-50km/h
Replace entire transmission mount
Suggestion or failed attempt
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Reported fixes
0
Unsuccessful attempts
1
Discussions
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Discussions that contain suggestions
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Suggestion
So, rather than having my mechanic replace the transmission mount bushings and risk possible misalignment, I had him replace the entire transmission mount.
Slight Clunk on/off gas pedal at low speeds 30-50km/h
Replace already
Suggestion or failed attempt
No successful repair reported for this finding.
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Reported fixes
1
Unsuccessful attempts
1
Discussions
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Discussions that report an unsuccessful attempt
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Unsuccessful attempt
I had already replaced the engine mounts, which did not solve the problem.
Slight Clunk on/off gas pedal at low speeds 30-50km/h
Replace entire transmission mount
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
So, rather than having my mechanic replace the transmission mount bushings and risk possible misalignment, I had him replace the entire transmission mount.
Slight Clunk on/off gas pedal at low speeds 30-50km/h
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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.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261027T173940Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi All, have a quick question.
Porsche 996.2 C2, Automatic gearbox.
Have this slight clunk sound from the rear on/off gas at slow speeds ( 40- 50 km/h ) Can be heard here -
You Tube
Any suggestions? The driveshaft, U-joints, bearings? Taking to the mechanic next week to see what we can find.
Based on description I would have guessed CV joints but video sound seems to be a gearbox noise, can you get car up on a lift and get under car to better locate the noise?
Rich
The noise in my '03 996 Tiptronic was a thunk when I abruptly accelerated. The noise was caused by the transmission mount bushings that had severely deteriorated. I had already replaced the engine mounts, which did not solve the problem. So, rather than having my mechanic replace the transmission mount bushings and risk possible misalignment, I had him replace the entire transmission mount. I figured that the labor cost to press the old bushings out and then press in the new bushings it would be the same cost as the price of the new mount.
I hope this helps.
Had a chance to lift the car, and checked the engine mounts - solid, transmission mount look good too. Tried to find anything that could move around and make the clunk noise, didn't find anything. Everyting looks dry and in good shape. Will take a car to the transmission service and do diagnostics.
At this point, I think most likely its transmission.
I took the car to another shop, lifted it, and inspected everything. We found this (video), and I'm fairly certain it's the cause of the slight clunk or thump when lightly pressing the gas pedal—whether accelerating or decelerating. It seems there's some movement in the gearbox. Has anyone experienced this issue and can offer insight into what it might be?
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You Tube
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