I am overhauling a 1990s Trek 970. It is on the stand and when the rear wheel is spinning but the pedals are not turning (inotherwords, coasting on the stand) there is an extra rhythmic clicking noise, much less frequent and much, much louder the the typical freehub click. It sounded like it was coming from the hub.

I took off the wheel, took the cassette, axle, etc. off. I spun the wheel in my hand, holding the freehub. I thought I could feel the extra click or bump, but wasn't entirely sure. I took off the freehub and cleaned it as per Park Tool instructions. I oiled it and put it back on the wheel. I cleaned, lubed and installed everything else. Put the wheel back on and it still has the same extra click.

Ideas? Do I need a new freehub body? Is there any chance it could be the cassette? I don't have a spare but I could hunt one down. I would note that the cassette was tough to remove (not the lockring, the cassette body) and I had to give it a tap from the backside. There also were little gouges in the freehub body.