Video would help. The SST was designed to develop lots of slip in cold temps to get heat into the clutches. I see around 55 at the coldest parking outside and I always idle the car to nearly full temp before I go, only takes 2 minutes. I don't hear grinding but if I operate it cold it sometimes clunks into gear.
When was the last time you changes filter and fluid? That is always a good idea to be premature in.
When was the last time you changes filter and fluid? That is always a good idea to be premature in.