From what I understand, this is a common problem with this Samsung made Maytag Neptune dryer. The dryer was making a sound like it had a shoe in it every time it was drying. The crack was in the seam at the back of the drum behind one of the baffolds so you can't see it when you look inside. I did not see it until I took the top off the dryer, looked inside and saw light through the hole. To take the dryer apart, first unhook it from the wall, gas, electricity, and exhaust. Remove 2 skrews from the top back side and slide the top of the dryer back and remove. The plastic control panel is then removed by taking 2 skrews out from the top, pulling the top of the control panel forward and reaching in with the other hand to pop out the plastic clips of the control panel from the front face of the dryer. Unplug the control panel from the electrical panel inside the dryer. Then you can remove the front door, 2 skrews, remove the front panel, 8 skrews I think, then the front piece the the drum rides on, 1 skrew. Take the belt loose and the drum will come right out. To install just reverse. Pretty easy once I figured out how to remove the control panel. I think the reason for the drum crack is it looks as though the back pressed metal piece that the drum rides on is not perfectly round. Even the new drum makes a very light thump sound and when I watched it go around with the top off the dryer I could see the drum turn slightly oblong. Check your wheels and make sure the axles are not worn, if they are, replace them at this time. Also you might as well replace the belt too.