this seems to be getting more noticeable now that its cold. Its just strange that it happens at a very specific speed 19-21mph, and doesnt change regardless of if the car is going straight or turning. I would think it would be different in a turn if it was a flex disc.

I need to try it again with the tranny in sport mode (step) and see if that changes the shift point and therefor the speed with the vibration. That would eliminate or identify if its transmission related

I will do a full driveline refresh in the spring, but I usually dont touch auto trannys with 95K miles.

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