Your TH400 kick-down is an electric solenoid.
Even when it is activated, the governor within your tranny will over-ride the valving, and allow an up-shift. The governor only allows a given RPM to be reached, (it is centrifically operated) before dictating an up-shift occur.
This is why your transmission will ultimately shift, even when the vacuume line is disconnected.
Even when it is activated, the governor within your tranny will over-ride the valving, and allow an up-shift. The governor only allows a given RPM to be reached, (it is centrifically operated) before dictating an up-shift occur.
This is why your transmission will ultimately shift, even when the vacuume line is disconnected.