Re: trans problem or tob
More than likely it's not an internal issue with your transmission. The way the internals of a transmission are designed with the rotating assemblies, a vibration would be due to an unbalanced part. Since most of the parts inside the tranny don't move much (except rotational movement) and are balanced upon creation, it's more than likely something else. Since you said that your car is a manual (clutch being all the way out and all that) and you said it has a vibration "when parked" it may be due to an engine problem. If it's vibrating after you let the clutch out and start rolling, I would say your clutch is going out, or at least the frition plate is, and you're getting whats called clutch chatter. This is when the clutch's friction materials skip across the surface of the flywheel because either they are non existant, or heat damaged, or the flywheel has heat spots on it's surface. If the car is rolling, during that RPM range it could indicate another set of problems altogether such as a bad u-joint, a very slightly bent driveshaft, or an inbalanced tire. Typically it's a tire or u-joint. I hope all this helps.