Slipping..
like changing and powerflushing the fluid might cause more slip if you haven't changed the fluid at all for that 60k miles (and the crud is holding the A4 from slipping)....this is what happened on my Mustang's AOD. so after that, i poured in 3 bottles of Lucas Trans. Fix....and it ran for another 4-5 months. you can do other cheap stuff like buy a used HPP3 and raise the shift firmness to 100% to get every last miles out of your dying trans.

