30 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH2nd Gear really bites hard!
Leading reported evidence
Replace tranny mount in two 996s
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 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.
Leading evidence: 'Replace tranny mount in two 996s' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'wheel hop' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check on pricing' (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 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
You may not need to actually replace the mount (I believe JayG used a drill press to get his out), but just reinforce it with an insert.
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 suspect a cause
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.
Suspected cause
If this was happening in first, I'd suspect wheel hop, but unless you're dumping the clutch into second, wheel hop is pretty much out - the 996 isn't much of a second-gear-chirp machine.
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.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
You are correct but my thought was to test first, see their condition and then if needed check on pricing.
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.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Checking the tranny mounts seems like a good place to start.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
wheel hop
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
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.
Suspected cause
If this was happening in first, I'd suspect wheel hop, but unless you're dumping the clutch into second, wheel hop is pretty much out - the 996 isn't much of a second-gear-chirp machine.
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.
30 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: 20261026T122219Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello my fellow 996 brethren!
Gotta a quick question... my last clutch change was about 10K miles ago by Porsche in Atlanta. I wouldn't say my clutch is slipping, but when I accelerate hard and shift fast into second at about 4,000 rpm it really shakes the car. It doesn't seem as smooth like shifting from 2nd to 3rd and so on. If I shift lower than 3000 rpm, then the shift is smoother, but if you rev match, it seems to really bite... almost like the muscle car guys trying to bark their tires in 2nd, if you get my drift.
Thoughts?
Thank you!
The front transmission mount might be going/is bad, and if so that can cause rough shifting. What is the mileage on the car, and do you know if that mount has ever been changed out?
One way to check is have someone look at the exhaust pipes on the car as you drive away - if they move up and down a lot then that front mount is probably shot. If it has never been replaced and you have enough miles to need a clutch then it is probably worn out.
Thanks Steve, I'll check this out asap.
When I shift into 2nd, the harsh movement in the car is coming from the rear and it has a modulated type sound.
Don't make fun of me here... hahaha
but it sounds like a wah-wah guitar. it modulates like 2 to 3 times as I shift immediately into 2nd while accelerating. And, the car kinda hops.
Maybe the car is a hippy? ha!
Sounds like your clutch may be slipping - transmission mounts or motor mounts "clunk" when they go bad rather than a rhythmic/repeating sound. If this was happening in first, I'd suspect wheel hop, but unless you're dumping the clutch into second, wheel hop is pretty much out - the 996 isn't much of a second-gear-chirp machine.
Not that I know of. You can test for clutch slip by shifting a little early into 4th/5th at freeway speed and getting onto the accelerator. If you see/hear RPMs rising faster than speed, you know the clutch is slipping...
Yea, I did that... and it accelerates with no loss of power and no noises. In fact, I can easily pass people on the highways in 6th gear.
I've also tried starting the car from a complete stop in 2nd and even 3rd gear, the car doesn't jump or anything... it slowly moves forward with no slip.
This is really weird. uggh.
Thanks... I'll try that next time.
I have shifted too early before and the engine bogs and the rpm drop below 2K, but nothing like you describe. I'll try this weekend and keep a close eye on the rpm vs. the speedo. Thanks again!!!
You are correct but my thought was to test first, see their condition and then if needed check on pricing. Here's a link to Pelican for "tranny" mounts:
http://www.pelicanparts.com/catalog/...pg3.htm#item13
This is for an '02 but the '99 should be the same.
Mine had one. Also I guess there is a special tool available, P/N# 104886090 to remove the old Trans. Mount and install without completely removing it from the car. But shelling $330 for that tool I just improvised and looked up a few DIYs. Cut the old one out then froze the new mount prior to install, used some Home Depot tubing can't recall the exact size and a 6-ton bushing press to push the new one in paying attention to the guide notch on the tranny and the alignment triangle on the mount along with some TLC hammering persuasion and in she went.
Only one transmission mount. Two motor mounts.
You may not need to actually replace the mount (I believe JayG used a drill press to get his out), but just reinforce it with an insert.
https://www.ecstuning.com/News/Porsc..._Mount_Insert/
I just needed to use the insert, as the mount hadn't failed, it was just starting to weather and crack.
As a side note, what do your motor mounts look like?
Motor and transmission mounts will get springy and bouncy just from the rubber being so old, even if they appear to be in good condition - Replacing the motor mounts and adding the transmission mount insert were the first things I did to my car after getting it, and it made a world of difference - drivetrain stays in place now and makes shifting much more predictable. If the dual-mass flywheel is getting worn out, it can cause noticeable slack in the drivetrain as well, which is pretty easy to feel on acceleration/deceleration transitions and also can contribute to clunky feeling shifts.
I must admit, I'm more electronically inclined that mechanically inclined and so I am clueless to these types of repairs, but I do have a mechanic in the family that has a lift. Or, maybe I'll just put it on stand and take some pictures. But I have no idea what condition they're in.
The car has spent all of it's life in Georgia and I still stay in contact with the original owner who was is a doctor in Atlanta. He explained that the car was only serviced by Porsche and always garaged. We have a mild climate in GA, and so the car wouldn't have seen much cold weather. Not that it matters in this case, but I thought I'd bring it out in context for the discussion.
The fix is lots easier if its the motor mounts. Are you exhaust tips level? Are they sagging? If so an hour invested in swapping motor mounts could cure your problem.
Replacing the tranny mount is a lot more work. The bulk of the work is getting the original one out. The less work option is the add on support.
I would be inclined to replace the motor mounts prior to the tranny mounts unless I knew they were good.
B3,
Your car most likely has the original transmission mount and if so it is almost positively worn out. Device2 gave the directions for "the fix". That said, it is also best to do this when you have the tranny out anyway. In car replacement is miserable at best. I believe it was Function First that came up with the inserts for the tranny mount. I haven't used them but, at least in theory, they should work well, are a fairly easy install without dropping the tranny and, come in different densities so that you can stiffen up the mount if you are so inclined.
I have replaced the tranny mount in two 996s. In both cases the engine mounts had already been replaced and while they made a difference, second gear engagement was still jerky and inconsistent. The tranny mount is THE mount that limits for/aft movement of the drivetrain. In both cases the second gear shift smoothed out and the drivetrain felt MUCH more nimble and "tight". Made the whole car just feel better.
I really appreciate the advice from everyone especially the PM about specific steps to take to resolve this issue. Talk about luck. I worried all weekend about this problem and went to drive the car on Saturday and looked down... and guess what? My brand new rear Michelin Pilot Sport was flatter than a fritter! Uggh!!!!! Yep, brand new and took them out ONCE and returned with a screw in it. I plugged it, but sure hope for what I paid for those tires, it will hold.
B3, from looking at your trans. mount picture it looks like you might be missing a section of the Trans Carrier Stop. (P/N:
99637525505) sample of complete one below.
Are you talking about that black piece? That looks like the Transmission mount inserts sold my Function First.
https://www.ecstuning.com/b-function...8BEaApcK8P8HAQ
Yes sir, the black piece there is a stock one that feels more like a cut up rubber inter-tube. The stock one doesn't have the teeth that protrude into the assembly like the FF ones. But don't worry I don't think the missing section would play that much of a difference besides pure esthetics.
This is a source reference. Confirm exact model applicability in the original material.
