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YOUR RESEARCHMan am I glad to be here
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newest guy
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Officially probably the newest guy on this site as i just joined tonight.
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Suggestion
You may be able to see the 1st/second gear slider through the oil fill hole in your center case.
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Suggestion
I'm currently have my transaxle apart to replace a worn pinion shaft 4 point bearing (I'm also replacing the input shaft 4 point bearing).
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Suggestion
i would replace the retaining plate to the GT3 forged version, billets shift forks from CMS are pretty cheap too.
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Suggestion
but i guess it's easier to put in a ball bearing ( best yet ) or gbox's detent, while fixing it "properly" requires opening the box and changing the stack placement by shimming and that's beyond the scope of many diy'rs,..
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but i guess it's easier to put in a ball bearing ( best yet ) or gbox's detent, while fixing it "properly" requires opening the box and changing the stack placement by shimming and that's beyond the scope of many diy'rs,..
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Officially probably the newest guy on this site as i just joined tonight. P car fan for life, it was finally time. Basically ready, fire, aim, as in i bought it without mentioning to my wife. I had hoped the old adage of forgiveness easier than permission would hold up for me- it did and she was begrudgingly defiantly happy for me, she can't stand that my 3 year old only wants to ride in "daddy's race car". 2004 996 Coupe, 46k miles, pretty stock except short shift kit (which i love), flared rockers, a few other niceties, but mostly stock.
Waited a long time to have a reason to come talk with you guys and I refused to join until i had a sled, good to be here. Cal
I'm currently have my transaxle apart to replace a worn pinion shaft 4 point bearing (I'm also replacing the input shaft 4 point bearing). Given this, I have two other items I would like to address.
1. What is the updated spec for 2nd gear?
2. I don't have 2nd hear pop out issues, but the dog ring does have some wear. What are my options to replace this?
Thanks for the help.
Here's a quick picture of the entertainment.
It's not an extremely difficult project, but man is it time consuming. Once you have all the metal dust in there from the worn bearing, everything has to be cleaned, which is as timing consuming as the tear down itself. The main issue is unless you have the correct special tools, you have no prayer of attempting this project.
Here's a picture of just a few of the special tools that are needed. For reference, the smallest socket in the picture is 30MM's and the extra long socket is for 41MM nuts. Thank goodness for knowing a retired Porsche tech for tools and knowledge.
Here's a picture of the bad bearing. Interestingly, the race was chewed up, but the ***** in the bearing still looked new.
sorry, dont have the specs ( they may even be proprietary to porsche )..try and make friends with a master p-tech?? ),..
..
but do know the new shim placement changes ever so slightly where 4th gear placement sits in the stack. only guys with the gear stack familiarity can talk you thru that one.
worn 2nd gear dogring = r&r all 1st and 2nd gear synchro's and all associated parts, assuming the gears themselves are not in the least bit rounded. problem is, if the dogrings are rounded, owing to the triple cone synchro's used, the gears themselves may have also taken some "rounding". this would of course require new 1/2 gears.
it isn't guesswork, the parts ALL need to be inspected since once opened, one never knows the condition of the gears vs the synchros' etc. BUT if it IS only 1/2 synchros and the bearings ( all ) that need replacing? consider yourself very lucky. good luck.
Congratulations indeed. My wife thinks the "toy" is a waste of money. Very pragmatic but enjoys the Carrera (as she did previous Boxsters) and knows I really enjoy it. It's only a waste because it isn't necessary, it's a much enjoyed frivolity.
Rep points for having the
cojones
to act when the Porsche opportunity arose.
Well played, sir.
You've inspired me to follow the dream and take the plunge...I'm tired of looking.
Enjoy the ride.
Thanks for the kind words. Next time out i'll take more pics, the one i posted was from dealers lot. Had a bunch of maintenance completed last week as the service history, while stamped in the book, was a little sketchy in my opinion. Considering FU IMS for a vanity plate, or maybe that might curse me ?
i would replace the retaining plate to the GT3 forged version, billets shift forks from CMS are pretty cheap too. just a few things while you are in there.
Congrats man. My girlfriend was happy for me just because she could tell how happy I was once I got the car. Greatest feeling in the world! Good luck with your new ride my man.
Does anyone have the part numbers for the GT2 steel syncro's?
I'm showing the standard parts below.
996 304 061 50 guide sleeve 1st/2nd
950 304 611 20 Synchroniser ring
996 304 613 20 Cone ring
950 304 617 20 Ring
Quote:
no part #'s on my receipt sorry. these are a few non high hp parts you will also need. there are 2 large locknuts at the front 1 time use need to replace them.
the # on my receipt for the steel syncs are 21130 and thats not a pcar #. if you can't find the # ill call the shop and see what they used
Slik, do it, you wont regret it. i get as much satisfaction seeing it clean and in the garage as i do driving it. Just because it's there finally. thanks for all the kind comments. next nice day here (in columbus that could be awhile) i will take some pictures and post. Thanks again, Cal
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There is no issue with the stock shaft, but the GT2RS has different ratios for 1st and 2nd which work better with modified cars. Basically 1st gear gets taller (which makes it more useful) and the ratios between 2nd and 3rd is tighten up.
Given the cost of this repair, the new clutch and all the maintenance items I'm doing on the engine (welded coolant pipes, new overflow reservoir, etc.), there's no more money for a new input shaft.
New four point bearings, a new 2nd gear and a new 1st/2nd guide sleeve are almost $1,500.
Later, Steve
Steve,
Look at the face on second gear and see if there is wear mark from the slider touching. if there is no mark you are getting full engagement. you need a center case with cut outs to see where anything lining up.
The shift forks are not adjustable so you need to shim the stack to get the throw right. You may be able to see the 1st/second gear slider through the oil fill hole in your center case. also make sure you line the the missing tooth up on the 1st/2nd slider with the oil hole on the pinion shaft. I would get the cms shift arrester
http://californiamotorsports.net/col...shift-arrester
Those are the only two i could get resized to the point it would take them.
Anyone else find themselves taking the longest route possible from A to B ?
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great! yet another part designed to avoid shimming the gear stack placement correctly and using a part in the transmission that doesn't really belong there. if thats isn't a "stopgap" measure then i don't know what might be? gbox detents/shift arresters?. though i like the 8mm ball bearing best as it makes the most sense from what little i understand of what it arrests ( presumably movement? lol )
while roger at ca motorsports knows his stuff as well as anyone when it come to g50 boxes, why always some stopgap measure is seen as a viable "fix"? just another half assed measure, when shims are all that is needed to update the specs from old ( wrong ) to "new" ( correct ) just my .02.
but i guess it's easier to put in a ball bearing ( best yet ) or gbox's detent, while fixing it "properly" requires opening the box and changing the stack placement by shimming and that's beyond the scope of many diy'rs,.. while a detent or an 8mm ball bearing isn't. i get that part.
whatever works. i'm just glad mine is shimmed properly
I dnon't call it the long way from A to B, but it is. I frequently take side streets and back roads rather than the highway which, at certain times, is not necessarily faster speeds. It "lengthens" the driving experience.
Beautiful car. Welcome to the club that I've only been a member in for a couple of weeks. I told the story before, but my wife actually *encouraged* me to get a ttx50 instead of a C4S. That surprised me.
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Welcome aboard! It's worse than that -- I find myself going out to run errands when I don't really need to. That means I go from A to B when I could just stay at A.
