Well I checked today and the car was left in park and the shifter removed... so it may take some time to check! haha. We have another 630 with an LSD in the back but that one's staying together for now.
I've been doing a lot of research on the 630csis. Though they were not the fastest 6... they are super rare apparently. Only 436 automatic 630csis were produced for the NA market (apart from the California specific models). The bodies were still built by Karmann at this point.
Though this car does not technically have the ownership... we can work something out if someone is seriously interested.