[tonycarreon]

it depends on how you drive it. the transmission will adapt to the current mode of driving. if you're mashing the pedal, it'll wait until close to redline before switching gears, additionally, it'll avoid shifting to the next higher gear on hard turns and overtakes. this is all normal.

if however, you don't think you were driving particularly hard (holding the pedal down past kick down) and driving more docile and it's still waiting to change, it could be something more.

first, you don't mention how many miles you have, if you were in manual or automatic mode or if it was displaying any faults / lights.

it may be time to change the ATF. it could be a vacuum line or a sensor.

get a durametric or have someone check for codes / problems.