Lets talk push button transmissions

Well there you go. Great write up.
Sounds like it ain't worth the hassle.
Any kick down linkage necessary
for the push button ?
yep, there is. but that's easily found and cheap. If you want to keep the push button, its not really a hassle. Most think it is, so they just sell the parts dirt cheap. Cables are the one exception. Oh that and the pushbuttons do have a different spline on the input shaft than 66 and newer 727s/904s so converter selection is limited unless custom built.