SONNAX ZipKit was a bear to put in because the directions were vague (made for Transmission shops, not shadetrees), reassembly was a cinch.
I could do it again in nothing flat know how to properly drop the valve body.
Along with the SONNAX ZipKit I added a reuseable pan gasket, new filter, drain plug and Royal Purple Synthetic ATF.
Delay from P to R, R to D and D to R is all but gone.
5K later the shifts are MUCH nicer, more firm and quicker.
I believe the issue was the fresh fluid (8 quarts when you drop the VB!!!) needed time to remove built up sludge and varnish.
I changed my fluid at 40K - DARK, not burnt. Future changes are at 30K from now on.