i second and third the alternator. after having went through four of them since january i have become quite to officiando of the music of the alternator. a whine that changes pitch with acceleration could be a bunch of things, worn difs, transmission, transfer case, wheel bearings, but i will lay dollars to donuts that it is the alternator.
to verify htis, pop the hood with the engine running. get your self a mechanics stethoscope. if you dont have on a goo alternative is to use a lenght of dowel rod, or more convienantly a long handled screw driver, place the meal end of the screw driver against the alternator casing, and press your ear against the handle. then either have someone sit inside and gie it some gas or you can do it yourself at the throttle linkage. listen for the pitch change as you throttle up and down tis will help you isolate it or rule it out.
if it is your alt, get a new one soon or you will also find yourself getting a new battery along with the alternator.
