2 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH1999 C4 Transmission and Strange Noises
Leading reported evidence
Check muffler bearings
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that contain suggestions
1
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Suggestion · Original poster
Or, am I barking up the wrong tree and just need to check the muffler bearings????
Leading evidence: 'Check muffler bearings' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check muffler bearings' (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 contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
You need to pull the transmission and inspect the clutch components first.
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.
2 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Pelican Parts: 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: 20261026T135432Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Howdy All-
I’m obviously new here, been lurking around for a while but after a Christmas Eve miracle (finally bought a Porsche) I figured it was time to actually become a member.
I bought it with some known issues that were easy to diagnose, as well as easy to fix. What’s been done- new wheel bearings up front, new shocks on all four corners, parking brake switch replaced to get the top working, rebuilt the top hydraulic actuator after realizing it had a significant leak.
Now it’s time to tackle the not so obvious issues. I’ll start by saying, the car drives great, it shifts perfectly (even into second), the clutch feels fine, it engages with minimal movement. So, every issue I’m about to describe is noise, I’m not feeling anything in the hands, feet or seat.
First, there is a dry bearing sound coming from about the front seat area and also possibly forward of there. After removing the belly pans, I noticed the u-joint on the drive shaft is slinging a bit of grease. Is this normal? Or could this be one of the noises I’m hearing?
Second, and most important, there is a clanking, thumping or rattling sound from behind the cabin of the car while decelerating with the clutch depressed and the shifter in gear or in neutral. The frequency Of the sound slows as the car slowed. Also, the trans just seems loud to me, but I really have nothing to compare it to. What is normal?
After the drive I drained the trans, the oil looked clean and had been serviced with the proper amount. I did discover some of the silver grease on the magnet.
Here’s where i could use some guidance, I know this silver grease is an indicator of a failing bearing in the trans, which could be the loudness I’m referring to. However, there wasn’t a huge amount of it like I’ve seen on YouTube. Do I have some time? The clutch feels great but I’m thinking the sound that slows as the car slows might be a throw out bearing… what would you do in my shoes? Should I bite the bullet have the trans rebuilt, throw a new clutch and components at it? I’m not opposed to spending some money on necessary repairs but don’t want to needlessly spend money either. Or, am I barking up the wrong tree and just need to check the muffler bearings????
I would appreciate and guidance you have to offer. I know its hard to diagnose based on my written description of sounds, so I thank you very much in advance.
Prost,
Michael
Michael,
You need to pull the transmission and inspect the clutch components first. And then also your cv joints. You will know a lot more after that.
Van
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