Kickdown fine tune adjustment

340,
Is there any particular reason you want to extend the shift speed in each gear?
I always went the opposite way for normal driving. Quick upshifts & let the t/converter do the work.
Read the thread, Sparky. He's said all along it shifts way too quickly and doesn't down shift properly. Both indicative of low throttle pressure. If he doesn't fix it and SOON, he'll be puling the transmission for a rebuild. I hope it's not too late now.