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Old 12-26-2016, 12:10 AM   #1
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2000-2004 Porsche Boxster S 6 speed manual transmission question

Hello,

I have a Porsche 914 and I'm converting the drive train to an LS1/boxster S 6 speed manual transaxle (2000-2004). I have the adapter built by KEP and a nice clutch setup they provided too. I'm in the market for a used gearbox and want to know what to look for when examining them. I've read through the forums and gleaned as much info as I could about the subject. Here's a summary of what I already know. Talked to Roger at CMS and he recommended getting one with the lowest mileage possible. I've read about the second gear problems and the sealed bearing issue, finger test. Looks like there's a second gear detent modification you can make. Seems its best to use OEM fluid in the thing. Cables and trans mounts can create issues.

What can I do when examining a gearbox?

Any help would be much appreciated!

Thankyou

Newbie Bill


Last edited by billium01; 12-26-2016 at 12:12 AM.
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Old 12-26-2016, 03:36 AM   #2
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While most of us may not have extensive experience with transmissions, I'd highly recommend asking a facebook group called: Transmission Building 101, what they think. I can't personally help, but hopefully it'll get you someone who can
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Old 12-26-2016, 03:46 AM   #3
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I saw a rough 914 with a small block Chevy conversion at Lime Rock take top time of day at a time
Trial event over some pretty fancy cars, you're going to have one fast car! Other than actually driving the car with the transmission still in it, buying a rebuilt unit or from someone you trust, I've got nothing to offer. Please post some pictures when it's done!
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Old 12-26-2016, 04:30 AM   #4
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Just buy the Audi box that it is and then you don't have to pay the premium associated with the name Porsche. It is widely available in Europe for just a few hundred $$ you can get one out of a FWD diesel A8 or something similar. Or just try this one, it is brand new
New Genuine VW Audi 6 Speed Manual Transmission Longitudinal Mount KTU Code | eBay
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Old 12-26-2016, 05:24 AM   #5
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That's the 01E transmission and is a stronger transmission than the Boxster 6 speed. Great transmission and one of the best. If you go that route, this guy is the king of building them over here in the states.
http://advanced****************************************** ******************/shop/
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Old 12-26-2016, 07:21 AM   #6
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That's the 01E transmission and is a stronger transmission than the Boxster 6 speed. Great transmission and one of the best. If you go that route, this guy is the king of building them over here in the states.
http://advanced****************************************** ******************/shop/
Woody,
Great suggestion to use an expert for the rebuild. Thank you. But the link does not work.Can you fix it for us?
Thank you.
Here is a video on the Audi 01E -looks quite different in some ways:
https://www.youtube.com/watch?v=sF4LXDhdZzs
https://www.youtube.com/watch?v=DgNwr_1isuc
https://www.youtube.com/watch?v=eHsARePtpXI

Last edited by Gelbster; 12-27-2016 at 06:18 PM.
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Old 12-26-2016, 08:13 AM   #7
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If you want to go the rebuild path I have a 02 6 speed with about 65k on it that needs a rebuild that I can sell for pretty cheap. It has the usual issue with the 2nd gear synchro having gone bad.
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Old 12-26-2016, 09:48 AM   #8
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While most of us may not have extensive experience with transmissions, I'd highly recommend asking a facebook group called: Transmission Building 101, what they think. I can't personally help, but hopefully it'll get you someone who can
Thanks! I'll check it out.
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Old 12-26-2016, 09:53 AM   #9
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Just buy the Audi box that it is and then you don't have to pay the premium associated with the name Porsche. It is widely available in Europe for just a few hundred $$ you can get one out of a FWD diesel A8 or something similar. Or just try this one, it is brand new
New Genuine VW Audi 6 Speed Manual Transmission Longitudinal Mount KTU Code | eBay
Thanks for the suggestion. Doesn't look like it would fit my adapter though : ( Different bellhousing
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Old 12-26-2016, 10:05 AM   #10
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If you want to go the rebuild path I have a 02 6 speed with about 65k on it that needs a rebuild that I can sell for pretty cheap. It has the usual issue with the 2nd gear synchro having gone bad.
thanks Porsche9

I'm really just looking for a low mileage unit though. Roger at CMS said these tranaxles while fairly cheap to attain, are very expensive to rebuild.
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Old 12-26-2016, 10:10 AM   #11
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I saw a rough 914 with a small block Chevy conversion at Lime Rock take top time of day at a time
Trial event over some pretty fancy cars, you're going to have one fast car! Other than actually driving the car with the transmission still in it, buying a rebuilt unit or from someone you trust, I've got nothing to offer. Please post some pictures when it's done!
Thanks PaulE

I think it'll be a great formula too. Probably wont have the opportunity to test a transmission still in the car unless I steal it haha. Its kind of a crapshoot. I'll definitely post some pics here.
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Old 12-26-2016, 10:55 AM   #12
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thanks Porsche9

I'm really just looking for a low mileage unit though. Roger at CMS said these tranaxles while fairly cheap to attain, are very expensive to rebuild.
My experience figure $1,500 to $1,800 for a used unit in decent shape and $3,000 to $4,000 for a rebuild. Second gear on a stock box is going to be an issue with the power that you will putting through the unit.

The guys over at Renegade, they put LS motors into Boxsters, may have some insight into how the 6 speed holds up to a big power increase.
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Old 12-26-2016, 06:37 PM   #13
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Seriously, just buy that box in my previous reply. If you manage to blow that one up then you can worry about getting an expensive box and upgrading it but that box is stronger than the Boxster so chances are it will hold up better and it is brand new and under 1k so I don't see how you can go wrong with that.
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Old 12-27-2016, 04:38 AM   #14
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Woody,
Great suggestion to use an expert for the rebuild. Thank you. But the link does not work.Can you fix it for us?
Thank you.
I can't keep the link from doing that? It's Advanced Automotion out of Corpus Christi,TX. The guy who runs it is like the Jake Raby of Audi and VW transmissions. He's very well known in the Audi/VW/Kit car forums.
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Last edited by itsnotanova; 12-27-2016 at 05:16 AM.
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Old 12-27-2016, 01:45 PM   #15
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So will that more robust audi/vw tranny mount up in place of the stock 986S 6-speed, or is it just for custom drivetrains?
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Old 12-27-2016, 02:53 PM   #16
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So will that more robust audi/vw tranny mount up in place of the stock 986S 6-speed, or is it just for custom drivetrains?
Looks like the starter is in a different position so no it would not be a straight swap. Figured it would work in a custom V8 set up but op seems to already have a specific adapter with the starter probably already cut out. Bolt pattern looks similar and Audi is famous for having a common one (except the VR6 based motors as they had their own) but the starter hole is the problem.
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Old 12-27-2016, 02:57 PM   #17
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Boxster 6 speed interchange Audi 01E

I started searching for Porsche G96+ Audi 01E interchange/parts swap info but found nothing definitive.Maybe the wrong search terms??
Suggest we start a separate thread on this specific issue so we do not hijack the OP?
I am a little skeptical of the Interchange only because in all the G96/6 speed research for the Boxster & 996 I have done, this is the first time the Audi 01E has been proposed as a solution. I am obviously missing something important so forgive my ignorance.
Maybe someone could ask Advanced Automotion? A guy who is billed as the Jake Raby of transmissions really needs a lot more exposure on 986 forum
Thanks for the connection Woody !
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Old 12-27-2016, 02:59 PM   #18
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Looks like the starter is in a different position so no it would not be a straight swap. Figured it would work in a custom V8 set up but op seems to already have a specific adapter with the starter probably already cut out. Bolt pattern looks similar and Audi is famous for having a common one (except the VR6 based motors as they had their own) but the starter hole is the problem.
Just swap bellhousing?
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Old 12-28-2016, 06:12 AM   #19
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Just swap bellhousing?
They don't unbolt like some transmissions, it's part of the casting of the case
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Old 12-28-2016, 07:22 AM   #20
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They don't unbolt like some transmissions, it's part of the casting of the case
see Post 6 above for details

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