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Alternators can sometimes whine when start up on a cold morning, they run on full load till they get the battery back up to full charge. When the whining stops, switch on electrical equipment (Headlights, fan full boost, heated rear window) if the whining starts again its the alternator.
if the sounds is comming from the rear sounds like crown and pinion is worn out , the crown and pinion in the rear diff will only hum or whine under load while in contact and when you let go the pedal there is no load equalling no noise. you can replace the crown and pinion but you do need some specialty tools like dial guages and spreaders and pinion depth guage
I would have someone check the U-Joints on the drive shaft. When they go bad they will cause a vibration when you are driving down the road. Taking your foot off the throttle stops it because the torque is being applied to/by the driveshaft any longer.
Well you can remove the sensor in the diff and make sure that looks ok they g obad quiet often also woulnd not hurt too remove the rear diff cover and inspect the rear end if it is whining and you dont see anything wrong i would refill it with lucas oil/grease and start praying check the pinion too and see if it has any play in it
hi these boxes tended to be a bit noisey anyway but a simple test for the release bearing and first motion shaft is easy first make sure g/box oil level is ok
start engine ,take your foot off the clutch peddle compleatly you have a whine, put your foot on the peddleVERYlightlynoise should change ,if the noise is more of a rattle than a whine it is coming from the clutch release bearing if it a definate whine it is either the spigot bearing in the flywheel or the first motion shaft