Dryer sounded like it had rocks in it when running

Following the instructions that came with the parts, I removed the top off of the dryer, which was very easy, two more 5/16" screws and I had the drum out. I confess, this was my second time at this repair. 1st time I neglected to replace the rear drum seal which I strongly recommend you do while you have it open. I only replaced the 2 wheels last time and it failed very soon afterwards.
Lesson Learned: Always replace the rear drum seal when you replace the support wheels!!!