727 Shifts Down to 2nd at highway speeds

You can run a TF without the KD hooked up and not harm it at all. If you notice, the rod has a slot that allows the carb to open without affecting the KD arm. If you never go past that point; there will be no damage. IF you think you have a low fluid problem, add another quart. If it's too much, drain it out the neutral safety switch.