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Originally Posted by Schurkey
When the modulator was connected to ported vacuum, releasing the gas pedal at 40 miles an hour still allowed the engine to instantly return to curb idle. Applying more pressure to the throttle would increase the RPM, but the vehicle still lost speed. A bit more power--and the RPM came up enough to engage the one-way clutch so the vehicle was, again, under power. Except for the smoothness of the re-engagement, it really did act like you threw the trans into neutral every time you backed off the gas pedal.
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Correct. When the transmission is hooked to a ported vacuum source the line pressure is maximum at closed throttle then again at WOT! When you released the pedal at 40 mph the pressure increased and downshifted the transmission instantly. That's why you lost speed and gained power, you where in second gear. It felt like neutral when you where off the gas because second was overruning, that's basically neutral until you regain rpm to out accelerate the driveline.
Had the 2nd brake been on, the transmission wouldn't have been overruning and the engine would've increased rpm (braking).
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