The issue was the rear drum support rollers.
First the front comes off and then the front drum support.
I used a sharpie to label all the wire colors in case one came off.
Each roller has a snap ring that keeps it on the axle so I needed to use snap ring pliers to remove the ring. I got a pair of those at the local hardware store for a couple of bucks.
Once the rollers were off I used a bit of emery cloth to clean up the axles. It was mainly the left roller that was the issue. This is the roller that's right above the heating element so I think it's the heat that eventually cooks the lubricant out of the bearings. This is a 1994 dryer so I can't complain.
After cleaning the axles and wiping any grit the new rollers went on smooth and I used the snap ring pliers to re-install the snap rings. Be careful, you don't want a snap ring to fly off and get lost.
Then it was a simple reverse assembly. The front drum support went back on and then the front.
Plugged it back in and in ran smooth as new!
You might see that I also bought front slide pads. The old ones seemed in good shape so I didn't bother to replace them. I put the new olds on a nail up in the floor joist above the dryer in case I need them at a later date.
We bought the dryer in 1994 and over the 24 years I replaced the belt twice an one motor and now the rear drum rollers. Hopefully I'll get 10 more years out of it. Generally it looks in good shape, the only real sign of wear is the felt drum gasket is getting worn in places.
I also have my 15 year old son helping with this job. He did a great job getting it apart and he installed one of the rollers. It's not tricky or difficult at all. Take pictures as you go just in case something tries to "fight you" when putting it back together.