Could be the drum cylinders as well..the rubber does deteriorate over time.
I did mine without replaceing the crush collar, but kind of took a 50/50 chance. You may need to get the pinion bearing pressed off though. This was 10 years ago and haven't touched one since.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.