This is a valuable thread for sure. My 03 996TT tranny was partially repaired very recently to resolve a 2nd gear jumping issue. It still jumps out. The Gbox detent sure sounded like an easy fix that they represented as solving 90% of the jumping issues. $200 for the little detent and another $200 to install it. No change, still jumps out on slower deceleration or declines. Not real happy about that at all. The ball makes sense I suppose. If so many are having good results, as stated herein, then it should be a no brainer to any competent wrench.
The shimming or undergear work would be standard when the trans is opened up, wouldn't you think? More importantly, if the shop replaced gears, shims and syncros and it still jumps out isn't that "their failure" to take every step to assure all the gear tolerances are correct" before putting it back in?
If you have a clogged artery do they simply unclog the one or do they check and repair everything, while they are in your chest, before buttoning you back up and sending you home? While the trans is out one would normally also check the clutch and other bits while it's open. Getting everything in your trans back to proper spec and condition is what you should expect, no less.
Odd Porsche hasn't issued a shop memorandum keynoting the best and proper way to address and resolve this issue.
The lion's share expense is the drop and re-install labor. We should certainly expect any certified shop to know all the in's and out's and fix it completely the first time.
So... what's the answer? Can this issue be resolved professionally and properly or not? It sure doesn't seem to be the case when so many spending big $ and continuing to have the issue. Tim's spacer to add positive pressure and sure footed gear changes is as good as any... assuming your transmission gears are not already damaged.

 

Odd Porsche hasn't issued a shop memorandum keynoting the best and proper way to address and resolve this issue. That is an understatement.

 

they have ( and did ) long ago. if the shop you're dealing with is unaware of this, dont use them to repair your box!

the bulk of your post presumes that porsche did nothing, knows nothing, and shared nothing. that simply is not the case. this issue is 12 years old bro.

also. i pointed to you at least once to the CMS "shift arrester" a fine piece of work, tim's 8mm ball bearing "fix" while "temporary" as well, has been lauded as being the far wiser choice of the two ( next to the the gbox detent you currently have which NO one will cosign, that i'm aware of??) but if it were me? i'd use the CMS shift arrester. there, I've only mentioned it three times! couple more pints.. and you'll have the guys address lol

 

A question not a presumption. I do wish I had researched here on the boards before following what sounded just right at the time. I am looking at the CMS now. That ball idea of Tim's is brilliant. Too late now me thinks. Listening to shops and individuals bat about their horror stories has me wondering why this isn't well addressed by Porsche and if it has, apparently, why don't these shops know? How can they possibly guarantee their work? Or do they? Or simply say "it's a Porsche problem" and be off the hook??
Before I choose which way to go next with my G96 turbo transmission I'm looking for some solid direction that doesn't start with "try this"... This thread is a very helpful eye opener. Thanks to all.

 

the answer as to why porsche might not be "more helpful"? would simply be because porsche sees the shops rightly as "competition" and every rebuilt transmission improperly shimmed is one more ( reasonably valid on its face? ) example they can reasonably cite in their understandable argument they might make to a customer AGAINST NOT USING PORSCHE FOR REPAIRS!

i.e. for them to say to the customer..:

"you should ( have had??) have us repair your transmission but you rather instead opted to try and save yourself several thousand dollars by going to an indie. would porsche guarantee an indie's work? of course not. would they assist them in having the work properly completed? certainly not, and why should they??

good indies know of this, hence my suggestion to you in making the determination before you agreed for one shop over another to repair your box.

i'm fairly certain porsche has ZERO liability of requirement to share their proprietary information with anyone other than their authorized service departments. which i am told they did, as early as 2008, but this now is requiring me to remember specifics that are less important to your issue. a dicey prospect at best! i DO know they ( porsch service dept's ) were informed of the UPDATED shim specs, as that's how I learned and then knew about them. through having to battle PCNA over what was the estimated to be a $12,000.00 transmission repair job on a recently purchased car. my argument was simple. it's my fourth 911, i did NOT misshift, you sold me a damaged yet CPO'd car. the argument was straightforward, the process to resolve it was as circuitous and fraught with argument and dismay as any you can imagine. little 'ol me VS PCNA. L O L. ( and fk them too )

this info was all gleaned directly from porsche and PCNA, with whom i dealt directly ( with whom i was “forced to deal” ) would be the more accurate term, as i was ( "forced" to deal ) in order that i not get stuck with their BS repair bill.

i did not.

 

Back here because of the Bringatrailer discussion... The ball bearing completely stopped the (very) occasional 2nd gear pop out I was experiencing on a 49-50K mile trans. It may be premature to call it a 'cure' at +1K miles of use, but I'm happy so far. My mechanic shimmed the cap on the trans so that the full 7.9mm wasn't added to spring tension...

 

Hi,
I've yet to try it but I have bought the ball. Interestingly, it's the same ball used in the third gear indent. Porsche has one there!

 

1.To see what the CMS part looks like ,see this link:
http://californiamotorsports.net/pro...shift-arrester
The much maligned GBox detent "upgrade" - the only difference I can see is that the roller is a much larger diameter than OEM.One effect of this larger diameter is much like the "8mm ball" idea - it increases spring pressure .
2.For the O.P's. mod - it would be interesting to know if anyone has used an appropriate dimension nut instead of a ball ? In theory it should work because the concept is to increase the effective power of the spring.So any spacer would work.
3.Any specific recommendation of a shop to rebuild these gearboxes or a diy write-up? The re-shimming of 4 gearset seems crucial.Parts,measurements,specs?
http://rennlist.com/forums/boxster-a...problem-2.html

 

it is, and if you're in la? you're in luck.

contact dan aspisi at "speed gallery" in NoHo. if he wants the work, he'll get your gearbox freshened up as expertly and inexpensively as is possible. he had mine done in a week.

PS the guy "roger" at cali motorsports ( cms ) really knows his sh*t too.

 

Thank you !

 

youre welcome!

 

Nope, those ***** (in two different diameters) are used in gear selector rod mechanism as locking devices.

 

very cool info! thanks!

 

OK this sounds like a nobrainer mod that everyone should do eventually. Here is a stupid question: Why not just add the ball on top of the spring, between the spring and plug? Simply remove the plug, add the ball and then reinstall the plug. Wouldn't that do the exact same thing without the hassle of trying to have the ball sit and line up on the piston?

 

Great info and thanks very much to the OP!! I was reading this thread and wondering exactly the same as magoochi. Does anybody know if as magoochi says above you can "Simply remove the plug, add the ball and then reinstall the plug."?