shifting hard on 2003 Buick LeSabre

my buick is shifting hare when you put in to drive and it revers up to almost 5 then takes a min tho shift back to 2 and when i am in stop and go trafic is shifts hard

Asked by for the 2003 Buick LeSabre
best to see a transmission ,aamco,lee myles,etc.
sounds like the tourq convertor,or worse