Kickdown or no Kickdown

GM guys have caused themselves a fair bit of grief over the years by not understanding how the throttle pressure linkage system worked on their own transmissions. This is the main reason the TH700r4/4L60 got an early reputation for being "weak" and unreliable (early 27-spline units had some issues). GM went to a Torqueflite style throttle pressure system to control system line pressure as opposed the the vacuum modulators on TH350/TH400. They even engineered a brilliant quick adjust cable so the highly important adjustment could be performed without tools (open throttle, push button and pull cable housing tight). Didn't work. Bubba decided it either wasn't needed or it could be used to "tune" the shift points. Wrong.