My opinion only, don't claim to know all the answers. Rear problems didn't start with the 560 circumstances happened to make it a bigger problem then. Bigger equipment used, more ground being worked by a tractor. Combined with a deeper R&P and standard first gear ratio than previous tractors, more torque was going through the differential bull gears and axles. Differential and bull pinion gear and shaft problems were happening also. When the 560 came out a good percent of previous tractors were still running near original power levels. Yes a lot had been souped some, but not near 100% like a 560. Good percent were used with smaller rear tire sizes also, at least part of there life.
Also fast hitches with traction control were becoming more common. When plowing or carring it or other impliments more load was placed on the axles and tires along with the drive train.
This post was edited by D Slater at 06:13:31 12/21/11.
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