When excellerating I get a high pitched humming noise. Release accellerator and the humming stops. I have had the transmission fluid change along with the filter yesterday. The mechanic said the fluid was good and there were hardly any shavings in it at all. Just normal shavings.

Check the transmission fluid level and condition. If the fluid level is off, correct it and then see what happens with the noise. If the fluid is discolored you should change the fluid and filter as a plugged filter can cause a noise.

that sounds like a throw out bearing failure-is there any adjustment at the slave cylinder-it may be holding the bearing against the clutch and causing the noise-this thread may help-http://www.jeepforum.com/forum/f9/how-change-bleed-clutch-slave-cylinder-511531/- cheers Denny

i would check the power steering fluid level and have your belts checked

HIGH PITCH WHINNING NOISE IS FAULTY TRANSMISSION OIL PUMP.HAVE THE TRANSMISSION FLUID PRESSURE CHECK AT A TRANSMISSION SHOP.IF TRANSMISSION OIL PUMP TOO WEAK OR MALFUNCTION.YOUR TRANSMISSION WONT HAVE ENOUGH OIL PRESSURE FOR FORWARD GEAR , REVERSE GEAR, BAND OR SHIFT VALVES IN VALVE BODY.NOTHING WILL WORK TRANSMISSION.OIL PUMP LIKE HYDRALIC PUMP KEEPS EVERY THING WORKING..

Have you checked the transmission fluid? I believe the problem is within the transmission, because it wont go into gear. A whining noise, or high pitch noise, can be caused by low transmission fluid, which allows air to get in the transmission lines, or it could be a bad transmission pump. This is for a automatic transmission, since it is what I believe that you have in your car.

you could be low on transmission fluid check that and make sure it registering properly on the dipstick.

sounds like the bearing in the alternator is shot. take the belt off the alt. start car if it stops replace alt.

You need fluid!! The high pitched noise yu hear is air in the hydraulic sections of the transmission. Top up the fluid then find out where the leak is
Good Luck

Check your power steering fluid level, and system for leaks. May be a bad p/s pump as well. Hope this helps

this sounds like maybe a U-joint froze in one direction because it only make noise under load