05 fwd auto transmission downshifting

[littlemonster]

Greetings, I bought a 2005 Pacifica touring two months ago. It has 107000 miles. Engine is 3.5 and fwd automatic transmission. My issue is when I start driving the transmission speeds and upshifts very well. The car accelerates quickly and even if the trany is on 4th speed, it goes back to 3rd speed if I want to make a pass or speeding the car. But, when I make a slight stop in a traffic light or speed-bumps, the car downshifts to 2nd gear while its slowing to 10 m/hr and then downshifts to 1st gear when reaches 5 m/hr. The both I can feel them and the engine rev still the same "idle speed" while braking. If I am driving 40 m/hr or more and make a full stop, I feel nothing and the transmission downshifts smoothly. No fluid burn, no sounds, no check engine light, the car is very smooth when you drive it. I wonder if this is a normal downshifting in Chrysler Pacifica's models? Because I used to drive many cars and I never had such a weird transmission downshifting like the pacifica. Or I need to do a mechanical repair. Thanks for this valuable forum and I believe you'll get me the right answer.

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