Peter,
The CV joints were repacked a few months ago and I noticed they looked really good inside, almost new (The joint boots were split and falling apart). Would these wheel bearings require a load on them instead of freewheeling to make that noise? There is no noticeable play in them at all. On newer cars, bad wheel bearings create a roar and you can usually tell after jacking up the front end and running it in gear and tell more accurately which one it is. I just wonder if these Lancia/Fiat bearings make a different sound under different conditions? Are the central shaft bearings the first to go or do they last for a while? That one would be easier to replace, but would rather find which one is the culprit instead.