Transmission mount diagnosing a vibration

What is your question?

eng in drive brake on at idle rpm slight vibration noted. neutral no vibes, reverse no vibes. only in drive at idle can you feel that slight vibration in engine/trans transferring to driver area. mount appears unbroken visually.

What makes this problem better or worse?

idle only put in nurtural or reverse no noise as in drive. Drive only vibes/rough feel.

How long has your 2004 Cadillac CTS had this problem?

been creeping up on operation, probably a year at least.