RAW, whether or not it was true, the worm gear drive was blamed for the Fordson's tendency to flip. When you push the clutch in on a hypoid geared tractor, you instantly remove all torque from the wheels and the front end comes down. Disengaging the clutch on a worm gear, however, effectively sets the brakes on the rear wheels. So there is still torque to hold the front end of the tractor in the air. And if the tractor's front end is rising rapidly, it will have significant angular momentum. It seems reasonable to think that in the right circumstances the angular momentum of the tractor combined with the locked-up rear could cause it to continue to flip after the clutch is disengaged.
I looked into this a little further. It seems that the later Fordsons with the worm gear on the bottom of the differential had a greater tendency to flip. So it seems that the higher CG caused by larger rear wheels was a contributing factor.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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