Kenmore Washer Won't Spin

This is my washer. It is a Kenmore and says Kenmore Heavy Duty Plus on the right hand side. I’ve searched in vein for a model # and can’t find it, anywhere. For a few weeks, the washer has been making loud screaming noises when spinning. Now, it won’t spin but instead it sounds like something is trying to engage (buzzing noise) but it won’t do anything. I emptied out the water with a shop vac. I love this old machine because I believe these older models will always be superior to the new products on the market. I’m not too handy but have performed a few repairs. Could this be a belt issue or do you think the transmission is blown? Thanks for any help you can offer!