automatic transmission takes too long to downshift under hard acceleration

What is your question?

on freeway passing situations,or when just trying to get around a slow moving vehicle,i will depress the accelerator and the transmission will hesitate for what seems like a minute prob.more like 10 seconds before it kicks down to proper gear.05 Tahoe Z71, off road suspension,5.3 ltr, non flex fuel, 460le trans,no power train or electrical modifications yet,ran a scan with a obd2 scanner no codes indicating a faulty tpcs please help me solve this. thank you