It certainly sounds related to the clutch/ engagement system. Is it safe to say all the parts installed have been confirmed as fitting that year? I know certain models had different disc thicknesses.
Check out these older threads about a similar issue. They might help:
https://forums.pelicanparts.com/porsche-911-technical-forum/1099056-sportomatic-clutch-slipping.html
https://forums.pelicanparts.com/porsche-911-technical-forum/562567-1971-sportomatic-repair.html
Last edited by Matt at Pelican Parts; 10-23-2023 at 04:23 PM..
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