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YOUR RESEARCHCluck when coming off and on the gas, the search continues??
Reported or suspected cause
brace
Reported cause
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Reported cause
But it turned out to be the brace that runs left to right under the gearbox.
Cluck when coming off and on the gas, the search continues??
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Leading evidence: 'brace' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'brace' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Adjust position' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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.
Discussions that report identifying a cause
1
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Reported cause
Had it on the ramps at my local garage and they said it was the coffin arms.
Cluck when coming off and on the gas, the search continues??
Install rss engine mounts and powerflex gearbox insert
Performed · outcome unconfirmed
No successful repair reported for this finding.
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0
Unsuccessful attempts
1
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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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Performed · outcome unconfirmed
:stay: My car does this and has similar mods, I'm pretty sure I started noticing the 'clunk' after I fitted the RSS engine mounts and Powerflex gearbox insert, it's on my list to investigate but I seem to have a pretty long 'to do' list :roll:
Cluck when coming off and on the gas, the search continues??
Adjust position
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Discussions that contain suggestions
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Suggestion
You need to adjust the position using various thickness shims.
Cluck when coming off and on the gas, the search continues??
Clean repainted and everything i could find
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Suggestion · Original poster
While I was under the car doing the suspension and mounts everything that else that needed it was cleaned, repainted and everything I could find with a bolt was checked to make sure all tight.
Cluck when coming off and on the gas, the search continues??
Clean repainted and everything i could find
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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Discussions that contain suggestions
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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 · Original poster
While I was under the car doing the suspension and mounts everything that else that needed it was cleaned, repainted and everything I could find with a bolt was checked to make sure all tight.
Cluck when coming off and on the gas, the search continues??
Install rss engine mounts and powerflex gearbox insert
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.
Performed · outcome unconfirmed
:stay: My car does this and has similar mods, I'm pretty sure I started noticing the 'clunk' after I fitted the RSS engine mounts and Powerflex gearbox insert, it's on my list to investigate but I seem to have a pretty long 'to do' list :roll:
Cluck when coming off and on the gas, the search continues??
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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.
15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 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: 20261026T194705Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
As the title really, I've had a clunk for a while, sometimes I can live with it but other times (like now!) it really bugs me. It's noticeable more when coming off the gas, at low as well as high speeds but I can also blip the throttle to get it.
So far relevant work within the last 12 months includes replacing all my suspension, dropped by 30mm , new clutch and 997 shifter. New engine mounts and PowerFlex gearbox mount insert.
While I was under the car doing the suspension and mounts everything that else that needed it was cleaned, repainted and everything I could find with a bolt was checked to make sure all tight.
Reading around the only other suggestions I could find were the drive shaft CV joints but I'm not sure. Anyone else have any suggestions?
Thanks
_________________
2002 Porsche 996 C2
:stay: My car does this and has similar mods, I'm pretty sure I started noticing the 'clunk' after I fitted the RSS engine mounts and Powerflex gearbox insert, it's on my list to investigate but I seem to have a pretty long 'to do' list :roll:
Thanks both.
Mines an 02 C2 with £126k, it does feel gearbox/drive shaft related.
I can't remember that it's always done it but it's certainly more noticeable. The suspension I did anyway but the gearbox and engine mounts I've done trying to sort the clunk.
It's play between you diff & pinion gear. You need to adjust the position using various thickness shims.
Edit: or your diff. bearings could also be worn.
I had a horrible clunk on/off power that I was convinced was my flywheel bolts come loose after I had it all apart. Had it on the ramps at my local garage and they said it was the coffin arms.
But it turned out to be the brace that runs left to right under the gearbox.
The bolts were tight, but I removed it again, cleaned up corrosion on the ends and mounting faces and re-torqued the bolts down and the clunk was gone.
Thanks, unfortunately I can't pin point when I started to notice it so I can trace back what might be the cause. When I stripped the suspension I did remove the braces, sand them back and repaint them. I'll certainly double check them though.
I'll try and record the noise but I don't think the camera will pick it up. I can feel it as well, not through the pedal or steering wheel but definitely from the back. It's one of those knocks that if someone else drove the car they might not even notice it but as it's my car it's bugging me.
If you jack up one of the rear wheels and put it in 1st gear then rotate the wheel you maybe able to reproduce the noise and track where it's coming from
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