I have a '98 Venge v6, Automatic, 85K miles.
Since I have exhaust put on , I am able to 'hear' What's going on with how my car shifts.
From time to time when it shifts(I've noticed from 3rd to 4th) It kinda jerks a lil bit, the engine Revs a little high,
then you feel it shift in to 4th.
I know what you are talking about, and it is normal. At least for every other venge ive driven. When accerating slowly enough to like 65mph, the car will go 2nd, 3rd, then 3rd with torque converter lockup, then the TC will disengage from lockup right before entering 4th gear, to give you a little gearing boost when coming upon 60mph. That 'revving' you hear before 4th is just the TC disengaging from lockup. It is very prevailent on cars with exhaust because you can hear everything.
And as for whomever said avengers are not slow because they can do 130+, thats no the point. Its how fast you achieve 130mph is what makes a car fast or slow.