Every time I let the clutch out on my '91, it feels like the driveline will vibrate horribly. (and yes, I can tell the difference between that, and doing a poor job letting the clutch out. ) I have had problems before with the rear drums not always releasing when I took my foot off the brake pedal, but now they have beem dismantled, cleaned, and the shoes replaced. The problem persists. If anybody has had this, or has a good idea what it might be, I'd love tuh hear from yuh.