<<<Sometime it will quiet down.>>>
Most likely needs new DRUM ROLLERS 4581EL3001A
Early LG dryers *did* have the potential for the DRUM developing a split/crack---at the weld seam.
This was resolved at/about early 2006.
Also---during the period of approximately 2003 to early 2005---LG dryer DRUM ROLLERS were known to *flat-spot*.
These ROLLERS were identified by having a white rim.
Subsequent ROLLERS have blue-color rims (for easy identification).
On LG dryers with the original ROLLERS---noise occurs for the first few minutes (bump/bump/bump/bump)---until the rubber on the ROLLERS became softened from the heat (gas or electric dryers).
For the duration of the cycle---the warmed ROLLERS would quiet down to almost normal-level.