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Where is the whining noise actually coming from .. engine/gearbox or elsewhere?
A whining/screeching noise could be a drive belt .. such as the belt that drives the alternator.
On a manual car it could be the clutch bearing making the noise until it warms up. Does the clutch make a noise when you depress the pedal? That's the thrust bearing .. the bearing that operates the clutch.
I don't think you have too much to worry about. If you had engine trouble there would be knocks, rumbles and strange noises at all speeds.
A whining noise is usually associated with something spinning/turning .. such as a pulley/idler on a drive belt or a bearing alternator.
Put your mind at rest - get a mobile mechanic's opinion.
Start car and use a stethoscope.
Start car put car in park and and listen for the noise by placing the scope on any item you believe the noise is coming from. if this does not help you confirm where the noise is coming from do the following:
Do you still hear whinning? put car in park after start up and listen for noise.Do the same in neutral. What do you hear? Drive vehicle in all gears. If you hear whinning in all gears its the oil pump inside the converter. Have this verified by a transmission repair shop.
Thank you for getting back to me. I would like you to check your transmission fluid. start the engine and let it warm up at idle speed for about 15 min and check the fluid. It sounds like you do not have enough in it, there for the whining noise with increase of speed since your transmission is speeding up with the rate of your vehicle. If this does not help and the problem persist please let me know. If the noise you were hearing was coming from the u joints of the vehicle it would not make a whining noise with increase of speed. The u joints will only make a noise when they are going bad when the vehicle is shifted into any gear from the shifter( EX: park to drive, park to reverse ECT.)
check your idler, and tensioner pully's, i've seen a few trailblazers that whine and it turns out to be an idler pully, also check the power steering fluid and make sure its full in accordance with your owners manual
whinning sound not from the timming chain it would be a deeper noise alternator belt does that often belt loose and worn out when its cold slip on the pouly and finally grap when its warm if you have any other question ill be honor to help you im pierre from montreal hope it help fixya the post