Kevin that is correct EXCEPT direct will engage in Low or High gear. But the speed is no different, so unless you stay in Low up to a real good speed, you'll never feel it. This is true in ALL Ultras 49-56. To be clear, this does not happen in Drive on the Twin Ultras. Those go from Low Converter -> High Converter -> High Direct with no exception except if you floor it in High Direct you will drop down to Low Converter in one operation, referred to as Kickdown.
"53", these questions can be easily answered by referencing the
charts and the
Ultramatic manual.
In short, the direct shift throttle valve compares the force applied by the throttle valve output pressure on one end and the governor output pressure on the other. For most intents and purposes, the throttle valve pressure is proportional to throttle opening, and the governor pressure is proportional to car speed. When you're off the throttle, the governor pressure will exceed the throttle pressure against this valve once you hit about 15 MPH. At full throttle, about 35-40 MPH; and at kickdown (= "full throttle plus") it's 50 MPH. The same is true when slowing down: imagine you're heading up a hill at moderate throttle and losing speed. You want the torque converter to kick back in, and the more throttle you need, the sooner (higher speed) you want this to happen so you get both more torque (from the converter) and more engine speed (as to not lug the engine) sooner rather than later. Of course this equates to more power overall; such is the "magic" of the converter on an automatic transmission.
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