Depending on what style/age of dryer you have, there should be a burner access panel on the bottom in the front of the dryer. pry it open with a standard/flat blade screw driver, and observe several small rollers that are connected to the belt that turns the drum. This may not apply for all dryers. Firstly, some might not have the front access panel and you might have to remove the back of the dryer housing to access the rollers. Once you have gotten to the rollers, lightly oil them with 3 in 1, or silicone oil spray. also lubricate the drum "track" while you have it taken apart. This should solve all dryer squeaks.
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