SAFETY NOTICE: Be sure to
to the appliance before performing any repairs.
On something like this we will need a model number in order to provide you with model specific troubleshooting tips. If this is a standard Whirlpool built Kenmore dryer I recommend removing the drum so you can inspect all moving parts. It sounds like the motor, drum rollers or rear bearing, depending on the make & model.
I am sending you instructions on accessing the drum on the most common Kenmore dryer. If you have a different model please reply back with a complete valid model number for further assistance.
Please click on the attachment below.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services