Excessive vibration and noise may be for the following causes: Machine not level, jam nuts missing or loose, noisy transmition, clutch bearings worn, clutch shoes worn, or the motor shaft bent.
Any load of laundry is ALWAYS off balance by a little. It's usually enough to cause vibration.
Your load may not be off balance, but your washer is! All washers have adjustable 'feet screws' in the front bottom corners of the machine that can adjust to balance the washer.