I just recently put a new alternator and water pump in my vl and now when im driving and slow down to stop, as it is idoling it makes a high pitched whistling sound any ideas on that??? Also when i take of from stopping there is a noise between vibrating and clunking coming from underneath the car you can feel it in your feet, i think that it is the diff but any other ideas??

Belt tension too tight/loose? Possibly tailshaft centre bearing.

yeah thanks mite be ill loosin the belt off becuase i put it as tite as i could and see if that makes a difference, if it is the tail shaft how much round about to get that fixed ??? thanks

You'll wear out bearings in the alternator and water pump real quick if you over tighten the belt. It's been about 4 years since i replaced my centre bearing so i couldn't even give a ballpark figure on replacement. Anyone? Also, if it only clunks once when you take off, could be a uni joint. If it's more a constant rumble or vibration then i'd say centre bearing.