My dad's 7000 recently developed a clunking sound when it's backing up. It doesn't make the noise at all in park or forward gears. It doesn't seem to be timed with the wheels, and it sounds like it's coming from the transmission area. The tractor backs up fine (so far); it just makes this knocking sound while it does it.
A mechanic said from the description it sounds like a broken tooth on the reverse gear. Does that sound reasonable? Any other ideas? Can we inspect the gear by just removing the tranny cover? Thanks,