the problem is either going to be the drum bearing or the front upper and lower felt and glides.I'll list a walk-through for you if your interested .
1)The first thing you need to do is unplug the dryer.
2) You will need to pop the top of the dryer. This can be done with a flat screwdriver. Place the driver between the top and the front of the dryer and basically just pry upwards.
3)Now, that you can see inside the dryer, the next thing is to remove the front of the machine. At the upper left and right sides you will find a screw that holds the front to the frame of the dryer.Remove these screws and you can take the front off.
4) The glides and felt are located on the inside of the front piece you just removed.The drum actually rest on these and if damaged will produce a metal on metal dragging sound. If these parts are good, continue to step 5)You now have access to the belt and idler pulley, which is good because the belt needs to taken loose .
6) WIth the belt off spin the drum and listen for the sound that has been bothering you, if any sound other than a smooth sound is emitted when turning the drum your rear bearing is out.
7)You can remove the drum by lifting the back end up and pulling it out. Once you have it out the bearing will be exposed and the rest is just swapping out the old bearing and putting it back together.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/jason_4570d45317834dd3