dryer was making a thump sound when drying clothes or when it came to a stop

My husband and I used a screwdriver to pry open the top of the dryer, then unscrewed the two front corners of it from the inside. Next, we disconnected wires attached to front lid, then pulled the big barrel of the dryer away from the rest of it. We put a new drum roller wheel on the left side and greased the inside perimeter of it. Next, we took off the old cushion set, and stuck on the newer set, and greased drum glide as well. Lastly, we took off the "old" belt, and replaced it with the one we purchased from PartSelect. We forgot how the old one came off the pulley, but after much trial and error, we figured it out in a snap! (this is why this project took us longer than we expected)
In conclusion, this company for parts is wonderful and I have been referring them to all of my friends!