The problem is in the main clutch. In order for it to be in the TA both the high side and the low side would have had to fail equally. That is not going to happen since the low side is mechanical and the high side is hydraulically applied. Once the low side fails it takes very little torque to get it to slip. If you do not have problems with steering at low idle and your hydraulic pressures are OK the high sides disks would have to worn out. An indication of that would be slow shifting when going from low TA to high TA. During the shift the tractor would stop if the low side sprague was out. Leakage in the TA assembly severe enough to cause slippage should also cause the TA lube light to come on.
The higher the gear you use the more lbs/ft of torque is requires by the transmission input shaft. Your slippage is directly related to to the amount of torque required which points directly to the engine clutch, not the TA.
If you really want to verify the slippage, take the cover off to access the clutch. Let the clutch slip for about a minute. That should be enough to things red hot. It will probably destroy the flywheel in the process but you would now for sure.
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