Bill: He's a bit older than my new grandson. The fun is only beginning. All the best to your dad. Now; Super C, could it be the wheel weight, those can make a thump. That failing jack that rear wheel under the axle housing, as the weight comes off the tire, pay particular attention to the axle in relation to the axle housing. I do this every year with all my tractors, whether I hear noise or not. Gives you a good idea the condition of axle bearings. Since the SC inner and outer bearing are about 14" apart, you should be able to pin it right down. Another idea is anchor tractor to another vehicle, with a wheel jacked up start the tractor and let it turn the jacked wheel in 1st gear. Cut off the Mrs. broom handle, ( woops not a good idea) get an old broom, stick one end to your ear and place the other end various places along the axle housing. You'll be amazed at what you can hear and actually pinpoint where noise is coming from. If you want to get fancy buy a stethescope.
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