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I'm going to say it is a main shaft bearing that is wearing out, much like a differential or axle bearing. You might do some online research for that model and see if it is a common problem with other owners.
normally, the only part of your automatic transmission that will make a whining noise is the pump. it usually whines when iether the fluid is low or more commonly when the transmission oil filter is getting plugged up.
the power steering pump will also make a whining noise too.
turn the wheel all the way to the right and hold steady pressure against the stop. this puts maximum force on the power steering pump and, if the power steering pump is the one making the whine, it will change the sound of it. (usually louder).
if the trans pump is making the whine noise, it should sound different in neutral compared to drive. this test will really only work if it make the noise without the vehicle moving. if it wont do it at idle hold the rpms at 2000 or so.
if you decide the noise is coming from the transmission, and the transmission filter has not been replaced (assuming you installed a used transmission), replace the filter by removing the oil pan.
oh and also, if it is the power steering pump you should be able to make it make the whining noise while the vehicle is stationary. if it wont make noise unless its moving its not the power steering pump.
If the trans has a whine and shifts a little hard then you need to take if to a service center and have the trans flush and filter changed this might correct the problem. But if you have never had the trans fluid change and have 100,000 on it trans might be going bad. Trans fluid and filter should be changed every 40,000 miles.
The serpentine belt is the most common cause for whining sound when accelerating, try to understand if noise is coming from serpentine belt.
Also check power steering belt under steering column, and also the rotor and chain, thei do not make whining noise , but can make noise when accelerating.
It may not be your trans at all. Look in the wheel wells for any loose plastic panels/mud flaps that may be hitting the tire. Give a slight tug on those panels to see if they are loose. Many times a loose panel will only contact the wheel when there is air moving to push it into the tire.
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