2002 Ford Explorer Rebuilt Tranny Delayed Shift

Transmission problem
2002 Ford Explorer V8 Front Wheel Drive Automatic 113K miles

Transmission problem
2002 Ford Explorer V8 Four Wheel Drive Automatic 113K miles

just had transmission rebuilt (installed an identical one that was already rebuilt)

Replaced bands
Update Solenoid Bloc
Installed shift kit
OD Servo
Bushing Servo
Exch Rebuilt Torque Converter
Int. Servo Piston
Seal Transfer Case

Drove the truck for about an hour and noticed a delay in shifting that was not there before. Example is driving on the highway at 60, let my foot off the accelerator for a few seconds, reengage the accelerator and about 3 or 4 seconds later the gear engages HARD. This happens at lower gears as well.

Took it back to the shop and they're saying that it's the shift kit and they can either take it off or I can learn to live with it. They said they see it a lot.

I'm researching the heck out of this and texting with a master tech and so far he's not convinced that it's the shift kit and I can't find anything that supports it either. Quite frankly the argument or sales pitch to the shift kit is to improve shift performance.

Any ideas? I have to make a decision to keep it or take it off. I'm not confident that taking it off will completely solve the issue.

I have kids in the car and we drive across country, and that hard shift/jerking constantly would annoy the mildest of people.

Help !