9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 Numeric Shifter, Cables, mounts
Leading reported evidence
Replace rear motor mounts
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.
Performed · outcome unconfirmed · Original poster
I also had replaced the rear motor mounts with OEM type mounts (that had solved the shaky car - passenger seat and shifter used to vibrate at idle)
Leading evidence: 'Replace rear motor mounts' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Fill voids in a too soft stock mount' (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 · Original poster
I changed the tranny oil to Amsoil Severe Gear, and that helped with the reserving issue.
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 · Original poster
Used the end of my ratchet (blunt enough to push on just the rubber)
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 · Original poster
I figured the harder "race" insert was going to fill voids in a too soft stock mount, so it would be just right.
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 · Original poster
if I had to do it all over again, I'd changed the gear oil first, then add the tranny mount.
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.
9 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 · 1 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T091943Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Firstly, thanks for everyone's input and info on this forum. It's helped me immensely since I got my 99 C2 last fall and been lurking around. My car had mostly stock everything and old fluids except for B&M short shift in stock plastic shifter.
I wanted to put some info out there for others who might find themselves in the same situation when they get a "new to them" 996. The transmission was a bear to deal with. Felt like driving a truck at times. First gear wouldn't engage all the time, needed to release clutch and give a it a bit of gas in N, then clutch down and it would reluctantly get into gear.
It would often I would get jammed up quick shifting from 2 to 3rd, hard accelerating. Also, would stall when I went into reverse and feather the throttle.
I changed the tranny oil to Amsoil Severe Gear, and that helped with the reserving issue. And still very "Crunchy" feeling when getting it into gears. So after a month and only 2000km, changed tranny oil to redline 75w90NS.
I decided to get the numeric shifter and cables - for durability and hopefully improve feel. This car has been my daily when it not full on winter. The numeric set up was not all that hard to install, many posts and videos helped me out greatly.
INSTALLATION - Some points not clear in my research I'll highlight:
- Cable ends are friction fit to the transmission end (ball and socket), easily popped off with a flat head screw driver
- the big rubber grommet plug for where the cables go from in the cabin to under the car, pushed out from the cabin after spraying silicon spray. Used the end of my ratchet (blunt enough to push on just the rubber)
- wrapped the cables in numeric's silicon tubing in a spiral cut, and still zipped tied - still has the effect of "piping" noise into the cabin
- wrench from numeric very much worth it. Setup adjustments, clamp down, etc done in 5 mins, and without it, could have been a 60min+ ordeal
- be careful to not manipulate/ flex the centre console, because it would fit back on there properly when screwed down.
REVIEW:
helped out with play in the shifter a lot, I could really feel like I'm moving the shift levers (whats under the car) - good and bad because it doesn't resolve other issues. Still was crunchy at times to get into gears, but not as often. Made the car more normal, but still made me second guess if I really needed to down shift mid-turn on a off-ramp.
I just installed a yellow transmission mount insert (Powerflex) yellow and it helped out a lot, and thought maybe a black (race version) would be even better. Now the transmission functions like it should. Can get into all the gears without issue and don;'t even second guess when I have to row the gears. I know the car is over 20yrs old and has 150K km's on it, but drives very nicely now.
The noise, vibration, harness (NVH) from the transmission mount insert was negligible as the numeric cables seem to be the biggest contributor on that aspect. It really sounds like a rasping AC vent that's on whenever the car is moving. I figured the harder "race" insert was going to fill voids in a too soft stock mount, so it would be just right. I also had replaced the rear motor mounts with OEM type mounts (that had solved the shaky car - passenger seat and shifter used to vibrate at idle)
Hopefully this helps the next person who picks up a used 996 and has the same considerations. Overall, that car is easy to wrench on, but can be time consuming due to some extra steps.
Thanks Rennlist community!
Sounds a lot like my 38K mile '99 C2 that I got back in March. The PO told me it doesn't like to shift into second gear on cold mornings (he tried changing the gear oil). It doesn't like to shift into first unless I'm stopped or I blip the throttle. And I also have had problems quickly shifting into 3rd when hitting it hard. I thought it was due to it being a new car to me and being away from a stick for 15 years. And like yours, mine feels "crunchy" but doesn't grind at all.
So the thing that helped this the most was the tranny mounts?
My car has a B&M style short shift kit. For the first minute or so when it is cold, 1st and 2nd gear are a little notchy. Once it warms up, it's actually very nice. I'm considering a numeric shifter and cables, but I'm not sure if I should prioritize it considering reviews like this.
Yeah, the tranny mount insert seemed to have the greatest effect on drivability. I bought both the yellow and black power flex ones. Tried the yellow for a couple days and it helped, but still wasn't going into gear very smoothly, "crunchy" and some shifts I would keep pressure on the shifter as I released the clutch, hoping it was in fact in gear all the way.
it's easy enough to swap out in my garage with jack stands, and took me about 1.5hrs the first go around and the last time, it took me 30 mins (including jacking up the whole car)
if I had to do it all over again, I'd changed the gear oil first, then add the tranny mount. in my case, the black ones seemed to solve the issues the most. But numeric cables add a lot of durability, so I would have probably done that with the shifter. Mine might have had original shift cables, and i wasn't willing to risk a break down out on the road
I have an eBay B&M knock off and it improved my shift experience 100%, everything was original with 135k on it and it was well worn.
I used to have trouble from 1-2 and reverse especially when cold (double clutch it and push hard)
The next thing I am going to do is the shift cable savers because one of mine is zip tied on currently.
https://tunersmotorsports.com/trs-de...6-997-986-987/
"
Did you install the trans insert yourself ? My car definitely needs it - I've read that a special tool is needed and the trans has to be dropped ?"
No "tranny drop" necessary to install the transmission mount insert(s). You don't even need to drop the trans to do the transmission mount bushing - you will need a special tool to press it out & insert a new one though...
yup, did it in my garage. All you need is a screw driver and 10mm socket wrench to remove the plastic tray, and loosen 6 more plastic 10mm nuts the gain more access (narrow plastic under tray)
and the other nuts/ bolts were 15mm.
I used a jack and piece of wood to support the transmission, and maybe lowered it 1/2� to slide the inserts in
they just slipped in with some silicone spray to lube it up.
I torqued things back to 50ft*lbs
This is a source reference. Confirm exact model applicability in the original material.
