AOD Getting Nasty

[Nixon1]

Just a few questions as to normal behavior for a higher mileage AOD tranny. This tranny, if original, has got 147,000 miles on it and it feels non-rebuilt. Shifts into 2nd fine, but 3rd and Overdrive are total dogs. For the shifts to be bearable, I have to get the rpms above 2000 before it shifts. Below 2000, it's a hard, nasty, THUNK/kick/dull thud noise shift. That's true for both 3rd and Overdrive, although the Overdrive shift is also a farther one. Is this normal behavior for a higher mileage AOD, or is it well on its way out? TV cable was well out of adjustment for a while..tranny shop just installed a new one and upped the pressure a tad for slightly firmer shifts.

Thanks everyone...this tranny really worries me...I've never dealt with one so sloppy. And I used to complain about my 700-R4...that thing was cherry compared to this.