I just had a really random thought…seeing as everything engine related has shown to be ‘good’ perhaps an issue lies in the flywheel/clutch area, but specifically the flywheel.
It feels like an imbalance somewhere in the driveline. Seeing as nothing changed beside transmissions…and if I notice the ‘imbalance’ at idle and throughout the rpm’s, perhaps the flywheel is warped or out of balance??? I thought I’ve heard the dowels are particular to these flywheels, and when I put this thing in I don’t remember knowing much about this, in fact it’s possible I’m missing a dowel. This car has never shifted right and has always had clutch chatter issues, most specifically in reverse, and I need a new clutch…so I should just tear back into this thing soon and see what I find.