main shaft bearing
You need to lubricate and clean it.
More likely the bearings in your alternator wearing out. Get a new alternator.
Your question is vague, but since you used the words "squealing/grinding" I first start to look at the brakes. The squealing could be coming from your brake pads. Some brake pads come with a safety mechanism that alerts to when the brake pads are nearing replacement time. If you ignore that squealing then it turns to a grinding because there ain't no brake pad left. At this point, you're now looking at replacing the rotors as well as the pads. Rule of thumb is that if one side is bad then the other is just as bad or not far behind it.
possibly your wheel bearing is on its way out
To stop a standard transmission from grinding into third gear, check the level of the transmission fluid. If the noise continues, consult a mechanic.
If the transmission is grinding on a 1997 Honda Civic then the gears are worn down. The transmission will soon need a rebuild so it can operate smoothly.
No! Something is wrong.
if its a front wheel drive vehicle then it could be the axels
could be a wheel bearing...or just that its a french car
it needs a new transmission
sounds more like transmission slipping diff slipping would cause loud grinding or howling noise
A bad transmission. The sound is from metal grinding on eachother.