It's hard to hear the howling over the belts. I'd fix that then see if you still get the howling noise. The howling could be the speedo cable. Try removing the instrument cluster and drop a few drops of lube down the cable. In the past I've removed the trans end as well and spun the cable many times until I can see the lube starting to drip out the other end. Clean up any large drips of lube and make sure it's not coming out in volume, then reinstall everything.

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