What is the capacity of the dryer (IE 6 cu ft)? Also, Dryer makes a squeeking noise when running. Why?

What Dryer? there are different capacities. Squeaking could be the rollers.

You have to post a model number and manufacturer for us to know. The rollers that support the drum can be the cause of the squeak. It's best to replace them and lubricate them with white lithium grease. You should clean it all out, too. Look at this: https://www.askmehelpdesk.com/appliances/major-problem-kenmore-dryer-655887.html
Hope this helps.

Since there are many, many dryers it is impossible to answer your question. Squeaking can be rollers or belt.