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931 gearbox swap?

 
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Lau Christophersen  



Joined: 17 May 2013
Posts: 106
Location: Denmark/Copenhagen

PostPosted: Wed Dec 24, 2014 1:50 am    Post subject: 931 gearbox swap? Reply with quote

I have a 1979 Porsche 931 euro with the G31 dogleg gearbox, and I have trouble with the 2. gear syncro.
Now one of my friends have a 951 s eurospec. that he parts out, how much work is needed to fit the 951 gearbox on my car? I have all parts, transaxle, clutch etc.
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v8carreragts  



Joined: 05 Sep 2003
Posts: 665
Location: Tucson, AZ

PostPosted: Wed Dec 24, 2014 2:16 am    Post subject: Reply with quote

It is more time consuming than anything. Basically, you need to remove the G31, torque tube and shift tubes and either cut off the extensions that the transaxle mounts to on the rear torsion tube or replace the torsion tube with the one from the 951. The two supports will be in the way of the 951 transaxle.

You need to drop the rear torsion tube to remove and install the torque tubes which can be time consuming if the torsion tube hasn't been removed before.

Then you install the 951 torque tube and shift lever/rod and install the 951 transaxle. The CV shafts should bolt into the 951 flanges. You do not need to change the clutch or bellhousing. Although you may need to drill and tap a couple of bosses to attach the 931 mounts to the transaxle. You will also need the 016 type trans mounts. These are used on the 924 N/A with the AUDI 016 and the early 944 (up to 84) These will bolt to the transaxle and then to the 931 crossmember. You may need to chase the threaded holes in the crossmember but they will be there already as they are used for the N/A transaxle.
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CÚdric  



Joined: 27 Aug 2004
Posts: 2101
Location: Sweden

PostPosted: Wed Dec 24, 2014 3:45 am    Post subject: Reply with quote

Changing the first gears syncros is pretty straight forward with the guides that are out there, if you want to keep the cool gearbox
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