2005 Elantra Transmission hiccup or hesitation

when shifting from 2nd to 3rd (automatic transmission) the whole car seems to jerk and shake, plus you feel it accelerate more than usual. It doesn't do this with other gears, up or down. The odd thing, is that when the engine is cold, this doesn't happen, it happens after a while, when the engine starts to warm up. No codes, no lights. engine has 74k and it seems that fluid is about 1/4 qt overfull.

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