My tranny on the bench
03-21-2014, 01:19 AM
#17
Drifting
Join Date: Jul 2007
Location: The great Republic of Texas
Posts: 2,097
Likes: 0
Received 7 Likes
on
4 Posts
^ What Kevin said. Trust me, I learned it the hard way.
I had a catastrophic 3rd gear failure at Barber's front straight last December.
Barely three weeks after Bill's rebuild of my box, I was doing COTA (two drivers). No issues at all.
Next month I'm doing TWS with Chin.
I had a catastrophic 3rd gear failure at Barber's front straight last December.
Barely three weeks after Bill's rebuild of my box, I was doing COTA (two drivers). No issues at all.
Next month I'm doing TWS with Chin.
03-21-2014, 07:47 AM
#21
!["02996ttx50's Avatar](data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 50 50'><circle class='avatar-circle-default' fill='%23759d7b' cx='25px' cy='25px' r='20px'></circle><text class='avatar-text-default' x='49%' y='53%' fill='white' text-anchor='middle' alignment-baseline='middle'>"</text></svg>)
the rebuild depends on what is needed to replace, but since i only needed the bearings it was a quick in/out. 10 hrs give or take. so honestly it's a 15-20 hour job. bearings fail due to the sealed nature of them and the heat cycles. there's no way to lube them. they dry out, and fail. as noted above. *most* people replace the 1/2 synchros ( cheap and why not ) but not the 1-2 gears ( unless needed of course ) as that requires replacing the mainshaft as also noted above.
the removal of tyranny is quite another story, and mankind has been, and will continue the struggle against this for years to come, with little hope for success i'm afraid lol
03-21-2014, 12:07 PM
#23
that's nothing. i wrote to my gf using siri on my iphone that was i concerned about the rapid encroachment of tyranny, and she told me to stop worrying, and that some silly man in a killer dress couldn't hurt me.
03-21-2014, 05:09 PM
#24
Burning Brakes
Thread Starter
03-21-2014, 06:26 PM
#25
lol.i'm just here to amuse us simon. but gl with the trans! i think some folks that aren't in major metro areas, are at the MERCY of the mechanics they have around locally and your anecdotes tend to support that notion, i'm afraid.. i have the good fortune of having a race shop wrench on mine, and they know i know my sh*t ( within reason lol ) so i don't get bent over on prices or advise.
just to reiterate though. there are NO 89$ gearsets for these cars. 6-800 is more like it. the triple cone synchros or bearings? at 89 ( ballpark )? are a different story. GL brother.... just don't get fkd twice!
just to reiterate though. there are NO 89$ gearsets for these cars. 6-800 is more like it. the triple cone synchros or bearings? at 89 ( ballpark )? are a different story. GL brother.... just don't get fkd twice!
03-22-2014, 04:31 PM
#26
Nordschleife Master
What I understand about the Porsche bearings is they are sealed and greased. Eventually the grease washes out then the bearings go bad because of lack of lube. I have heard of some repair shops removing the bearing seals so the trans oil keeps them lubricated. You usually can find the grease on the bottom of the trans, and at the magnetic pickup located on the bottom.
03-22-2014, 07:06 PM
#27
what causes them to go bad..beyond that ridiculous factory gearoil change interval. i KNOW that can't be "right". i'm gonna change every 15-20k. dont wanna open that box up again.
03-22-2014, 07:53 PM
#28
Addict
Rennlist Member
Rennlist
Site Sponsor
Rennlist Member
Rennlist
Site Sponsor
The Porsche bean counters really hosed us turbo owners.. We paid the premium for the car, and we received crap in return with our gearbox vs the GT boxes..
Matt can tell us what it cost for (parts only) to upgrade the box using the factory cooler and pump, rear housing AND limited slip!
Matt can tell us what it cost for (parts only) to upgrade the box using the factory cooler and pump, rear housing AND limited slip!
03-22-2014, 09:10 PM
#29
Addict
Rennlist Member
Rennlist Member
OP I could have written this thread. I will have well over $10k in my transmission rebuild when I pay the second mechanic. Looks like the second time will be the charm. I'll know for sure when I put her on the track in a few weeks. Morale of the story, do significant homework before embarking on Porsche transmission work.
03-22-2014, 09:23 PM
#30
^ tis true. my first cars gbox had to be opened TWICE after the first rebuild for 2nd gear pop was unsuccessful. THEN the master tech at la's largest dealership discovered the amended specs from porsche that later called for different shim tolerances allowing for the alteration of the gear stack placement. gee, sure wish they;d thought of that the first time, but thankfully it was a CPO deal or i'd a been pissed.
but here's a fair list of all scenarios; taller gear sets - full synchro ring sets - oil cooller assemblies etc. (scroll down to the 6mt turbo section ) from roger at cms' site http://www.californiamotorsports.net/996.htm he's as comprehensive as anyone and matt was willing to share his advice also, and equally helpful. wish i had gone with the taller gear sets but i couldn't justify tossing perfectly good gears away! hell, i didn;t even need synchros this time round! i guess that double clutching helps.. if not my clutch slave! it hates it. ha
yeah.. these gear boxes.. kind of a weak link, i'd say
but here's a fair list of all scenarios; taller gear sets - full synchro ring sets - oil cooller assemblies etc. (scroll down to the 6mt turbo section ) from roger at cms' site http://www.californiamotorsports.net/996.htm he's as comprehensive as anyone and matt was willing to share his advice also, and equally helpful. wish i had gone with the taller gear sets but i couldn't justify tossing perfectly good gears away! hell, i didn;t even need synchros this time round! i guess that double clutching helps.. if not my clutch slave! it hates it. ha
yeah.. these gear boxes.. kind of a weak link, i'd say