Question are:
              1. On my 77 I cannot shift gears while engine is running            (  Gears grind ) Is it the clutch that needs replacing?

              2.  On my 66 its all that the tractor can do is pull itself along. After running for a bit it starts to smoke around the bellhousing. Is this also the clutch?

  Do I need to remove the engine out of the tractor to make repairs?

    Thanks