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chuck21401
Joined: 20 Feb 2005
Posts: 526
Location: Annapolis, MD
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 Posted: Sat Jun 08, 2019 4:06 am Post subject: Sources for rebuilt transmission for 1980 931 (G31) |
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I have a 1981 931 with a 1980 931 drivetrain which means it has the G31 transmission. I'm not sure if my car has a limited slip differential but I'm guessing probably not.
The transmission will need some attention at some point in the near future. It's tough to find first gear and grinds going into second if shifted quickly. I knew this when I bought the car...and so now I'm prioritizing which projects to conquer first.
I've read many of the G31 rebuild threads on the board and the concerns with the availability of certain parts.
I've done some searches and found some websites that claim to have rebuilt (or just used?) transmissions. I haven't called them yet because I'm not quite ready to buy but was curious to get opinions from this group. Having someone rebuild my transmission is an option but seems like there would be a ton of parts/labor involved. I'm guessing that these prices are too good to be true?
Here are the websites.
DC automotive. I've actually purchased used parts from them in the past and the parts were as described.
http://dcautocatalog.com/illustration/index/28260936
931.300.010.01 Make a bid:$1700
Turbo/GT G31.01 Good used transmission, 5mt, 90 day warranty, note additional shipping due to weight, priced with exchange #197
In stock
931.300.010.03 (80)
Turbo/GT G31.02 Good used transmission, 5mt, with limited slip differential, 90 day warranty, note additional shipping due to weight, priced with exchange
Not available
Einmaligparts
Porsche Replacement Transmission G31.02 924 Turbo 1980
Item: 931.300.010.01
Description: Replacement Transmission G31.02 924 Turbo 1980 - [New or Rebuilt] $876.10
http://www.einmaligparts.com/Replacement-Transmission-G3102-924-Turbo-1980_p_92749.html
Porsche Replacement Transmission With Limited-Slip Differe... 80 G31.02 1980 Only 5 Speed
Item: 931.300.010.03
Description: Replacement Transmission With Limited-Slip Differe... 80 G31.02 1980 Only 5 Speed - [New or Rebuilt] $1,558.25
http://www.einmaligparts.com/Replacement-Transmission-With-Limited-Slip-Differe-80-G3102-1980-Only-5-Speed_p_92750.html
I sent Einmaligparts an email...will let everyone know what I find out.
cogscogs
924-03 Porsche 924 Turbo Transmission Five Speed Complete, Type G31, 1979-80, large mainshaft $900
https://www.cogscogs.com/924-Complete-Transmissions-1980-85_c_1360.html
Replacement Transmission With Limited-Slip Differe... 80 G31.02 1980 Only 5 Speed
Your Price: $1,558.26
Used or Rebuilt
Part Number: 931.300.010.03
https://www.cogscogs.com/Replacement-Transmission_p_6479.html
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1981 Porsche 931 w/S1 engine & g31 transmission. Water-cooled intercooler |
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chuck21401
Joined: 20 Feb 2005
Posts: 526
Location: Annapolis, MD
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chuck21401
Joined: 20 Feb 2005
Posts: 526
Location: Annapolis, MD
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| Posted: Sun Jun 09, 2019 12:04 pm Post subject: |
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I’ve found that California motorsports offers a rebuild service for the G31
https://californiamotorsports.net/products/cms-porsche-924-transmission-rebuild
“We are familiar with and can service the 924 5 speed (including Turbo) "snail shell" transaxle. Some parts however are no longer available.
$1095 labor plus parts.”
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chuck21401
Joined: 20 Feb 2005
Posts: 526
Location: Annapolis, MD
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| Posted: Tue Jun 11, 2019 5:42 am Post subject: |
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Happened to see this on the 924 Facebook group...
Source for snail shell parts...anyone on the Board?
http://catellusengineering.com/parts/?fbclid=IwAR07KHypFWZyApunSYq8_D1Yc8b1IUPGwi9T-pBklr73MUdqwTTpsVObDuU
Type 016/Y VA VB first gear synchronizer ring
931-302-301-02, used in 924-series "snail shell" type VA and VB transmissions.
Type 016/Y VA VB first, second, third gear teeth
931-302-241-00 "dog ring," used in 924 "snail shell" type VA and VB transmissions. Never available from Porsche or in the aftermarket - until now!
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Cedric
Joined: 27 Aug 2004
Posts: 2608
Location: Sweden
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| Posted: Tue Jun 11, 2019 7:22 am Post subject: |
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I bought parts from CMS that you linked to above, via ideola when he was up and running with his store. Im not sure they still have all syncros and rings. i changed ring on 1st and synchros on 1-2-3. They werent bad but it was fun to change and the trans leaked so it was nice to seal it up.
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1980 924 Turbo
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Cedric
Joined: 27 Aug 2004
Posts: 2608
Location: Sweden
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| Posted: Tue Jun 11, 2019 7:23 am Post subject: |
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| chuck21401 wrote: | Happened to see this on the 924 Facebook group...
Source for snail shell parts...anyone on the Board?
http://catellusengineering.com/parts/?fbclid=IwAR07KHypFWZyApunSYq8_D1Yc8b1IUPGwi9T-pBklr73MUdqwTTpsVObDuU
Type 016/Y VA VB first gear synchronizer ring
931-302-301-02, used in 924-series "snail shell" type VA and VB transmissions.
Type 016/Y VA VB first, second, third gear teeth
931-302-241-00 "dog ring," used in 924 "snail shell" type VA and VB transmissions. Never available from Porsche or in the aftermarket - until now! |
Those are for the n/a version of the box, not the same as the g31 turbo box
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1980 924 Turbo
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chuck21401
Joined: 20 Feb 2005
Posts: 526
Location: Annapolis, MD
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| Posted: Wed Jun 12, 2019 1:23 am Post subject: |
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| Cédric wrote: |
Those are for the n/a version of the box, not the same as the g31 turbo box |
You are right...I misread it. Shoot.
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1981 Porsche 931 w/S1 engine & g31 transmission. Water-cooled intercooler |
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chuck21401
Joined: 20 Feb 2005
Posts: 526
Location: Annapolis, MD
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| Posted: Wed Jun 12, 2019 1:27 am Post subject: |
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| Cédric wrote: | | I bought parts from CMS that you linked to above, via ideola when he was up and running with his store. Im not sure they still have all syncros and rings. i changed ring on 1st and synchros on 1-2-3. They werent bad but it was fun to change and the trans leaked so it was nice to seal it up. |
Good to know. Unless I can find someone local ...I think I'll be shipping the transmission for a rebuild...hopefully this winter.
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1981 Porsche 931 w/S1 engine & g31 transmission. Water-cooled intercooler |
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