I have a 2002 XC70, and I am also having problems. I have just had an upgrade downloaded, and it is still revving between gears sometimes. Usually when I slow right down, using brakes, and then hit the accelerator fast to get across a dangerously blind intersection.
It also sometimes revs when changing from 3rd to 2nd, particularly on hills when travelling slowly.
This car comes out of warranty in less than a month and I'm not sure what else I can do to ascertain the problem. I have heard all sorts of explanations, like "well, those transmissions do have a bit of a lag in them", to "you must be driving with your left foot on the brake".
I just want to know if these symptoms are indicative of a pending meltdown in my gearbox.
Can anyone help?