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When the ATF fluid level is low, it should shift hard and at very high rpm's. This happened to me when switching the tranny fluid to Mobil 1 synthetic. As I added more fluid, the shifts were softer and the shift points were at a lower rpm. I don't know what over filling might do but I would correct the fluid level and then see if the hard shifting still persists.
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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
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'82 300D Turbodiesel - sold
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