trans kickdown line pressure

I am aware that for the 727 there need to be line pressure for the kick down linkage. I have a question and it may be a dumb one. I had a trans shop intall a Lokar kickdown cable in place of the actual linkage. It seems to work properly, but I questioned about "what about the spring tension" and such.
they said it held enough pressure. Can someone confirm this? I know alot of cars use the Lokar kick cables. Are they o.k. to use or and I sending my trans. to a quick grave?

next...if I want to adjust the kick down a bit on the cable do I just loosen the stop screw on the cable itself and make a slight adjjustment?

thanks all!

-RPM