[6shooter]

does it do it any worse or better when you turn on the lights, heater fan, etc? mine in my 98 went and would squeal when you put it under heavy electrical load only. (wipers on, headlights on, heater fan all at once) then it went away when i hit cruisin speed. just a thought. but the "not when its in park" thing is kind of fishy.

 

[6shooter]

noisey alts are a common problem and it doesn't mean there's anything wrong....

i doubt its squealin like mine was when it went out, then. mine sounded like a wet fan belt screamin in your face whenever you'd put a heavy electrical load on it, and that does mean somethings wrong. its the bearings takin a crap in the alt