BobbyFord wrote:Under normal driving conditions (non-WOT) the modulator valve (in conjunction with the governor) controls shift points. WOT = no vacuum on the modulator, increasing throttle valve pressure and lengthening shift points. Under light throttle the engine produces vacuum, which pulls on the modulator valve, reducing throttle valve pressure, resulting in lighter, earlier shifts.
Adjusting the modulator valve by turning the screw in, increases line pressure and lengthens the shift pattern (shift later.) Turning the screw counter-clockwise reduces line pressure and makes the trans shift sooner. The kickdown rod increases line pressure manually at WOT.
That's what I'm talking about! That's educational material right there. Thanks.
