TransGo TF3- tie back or run cable

Sorry, I was under the impression the TF3 kit made the TP inactive all together.
And a totally unrelated question since I have TrailBeast on the line here? I was over at a customer's house and he has his 2-speed Powerglide from the 68 El Camino and I grab the input shaft to check the play and it pulled out like an inch and a half!? That doesn't sound right at all!? What do you think?