You did not specify what symptoms your dryer has or if something of yours is missing. If you are hearing something as the drum rotates something could be loose in a vane.
This is an extremely labor intensive project, I recommend calling an experienced service technician to better evaluate and possibly repair your appliance.
I have included below an illustrated set of instructions on drum removal, the vane removal instructions along with cabinet tear down are included as well. You will need to decide if this is something you are comfortable doing.
Be careful, and always wear gloves when working around sharp metal parts
Always disconnect power to electrical appliances when removing the covers, or attempting service