Mechanic put car up on hoist and said it was noisy while driving. Original thought the differential sounded noisy but after talking to an expert in transmission rebuilds now thinks the planetary sounds noisy. However we are unsure whether the "whine" is indicating a serious problem down the track or is normal for this car
Planetary gears are normally straight cut spur gears and will be noisy in operation. There may be wear in the shafts that they run on and there may be needle bearing wear. Normally you will not hear the noise as you are inside the car. The whine is an indication of a mechanical problem and will be there in all gears . There is a possibility that the noise is from the diff but if you listen carefully when driving if it is there under load but changes on over run(coasting) then it will be the diff of is on and off when you hold a steady speed it will be the diff. Have an accredited transmission specialist shop give you another opinion but if it is the transmission I would not race out right away to have it replaced.
SOURCE: whine from 2005 corolla automatic transmission
Have the tranny serviced with fluid change and filter, if noise it still there it is the torque converter . Have the dealer fix it ,and have it on paper with dealer invoice when it is done. Do all this before warranty expires. IT IS NOT USUAL for any car, Toyota included, to have tranny whine!!!!!
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