check the first three digits of the model #. If it begins with a 110, it is made by whirlpool; a 363 is made by GE; a 417 is made by Fridgidaire;
you said it sounds like pennies??? If it sounds like change rattling inside drum it could be that some coins have gotten inside the drum vanes. If it is squeaking could be the cabinet rubbing some differnt locations or the spindle support if it made by GE or Fridgidaire. If it is a rumbling it could be the rollers on a whirlpool.