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John: Most thumps turn out to be loose wheels, wheel weights. However from what you describe, get a light and check drive shaft coupler through hole in torque tube for adjusting clutch. That coupler may be loose. Those are the easy checks. Next, firmly secure tractor, I like chaining drawbar to another vehicle. Jack each rear wheel separately, watching for looseness in rear axles as wheels clear ground. While you have each wheel jacked, start tractor and put it in gear allowing the jacked wheel to turn freely. While turning listen for the noise. If you wish to isolate just where, get a stethoscope or use an old wooden handle. cut both ends square. Put one end to your ear and other end at various places on tractor drive train. You will be amazed at what you can hear, and how closely you can pinpoint the problem. I will warn you, first time you do this you'll think whole tractor is a wreck, as you will hear a lot of noise you've never heard before. I had been using the old broom handle trick for years, when one day I was in a heavy truck shop, saw the technicians using stethoscopes. He told me it didn't require a very expensive stethoscope, becomming a very valuable tool in shops.
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