I just bought a perfect 07 x sedan but there is a slight drop of a couple hundred rpms and a slight bump around 40 mph or around 3rd to 4th shift that i feel , is that the torque converter locking up and is this normal. I feel nothing when I am really accelerating only when driving like grand ma.

 

I am having a similar problem. here's a bump

lemme know if you have figured it out yet pls