If your convert er temp goes up when hill climbi ng and returns to normal when not, then I would think it is getting the proper oil supply. If it were hot all the time that would be different. The converter must be full of oil all the time, if it was straved of oil and not full it would soon destroy itself. I would go back to the transmission control. There should be ports for checking the pressure on each clutch pack. Put gauges on all of them and see that they go to full pressure when in use and turn to zero when not. You may have a leak that allows partial pressue to a clutch when it should not have any causing an internal drag in the transmission. That is the only thing I can think of that would cause your strange problem.
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