At 70 mph truck revs high at 3 RPMS will not shift , gets stuck unless I let off gas

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It's starts off fine but as soon as I get on the freeway and get to 70 mph it begins to Rev very high and sticks at 3 RPMS..sometimes if I let off the gas it will shift but not always eventually it will shift gears and the rpms will drop to normal..I replaced the shift solenoid and the governor pressure solenoid ..but no change still review high Is my professor G out there anywhere.