Juddering on acceleration

My 03 2nd Gen with the 4AT transmission suffers from a pronounced juddering when accelerating. The car is relatively smooth when starting off but then judders when speeding up between say 30 and 60 mph. It appears to smooth out once it;s in top gear. I've done all the usual stuff with wheel balancing, tyre rotation and even new tyres but nothing cures it. Someone suggested that it might actually be a problem with the auto box itself. Any ideas? All suggestions gratefully received. Tks
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