Problem solved. I jacked up the rear end and started it up, checked the belt, pulley, fan blade. Everything ran fine so I removed the driveshaft and took it to a specialist, they told me it was so far out of tune it couldn’t be fixed so they cut off the ends and welded them on a new tube and balanced it. $188. Just now went for a test run, got it up to 45 mph and it was all smooth sailing!