94 Park Avenue transmission issues

I just purchased a 94 park ave. I was told that the transmission needs to be replaced. After seeing the car and deciding I wanted it, we asked more questions about the transmission problems. The previous owner stated that it does run but when the transmission gets hot it seizes. Once it cools off it drives again. We plan to change the filter and replace the fluid, what else should I check out on it? Or does it sound like the transmission truly needs to be replaced? The car has 170,000 miles on it.

Thanks!!!

If the trans is overheating the PCM will go into imp home mode to try and save the Transmission.. But if its getting that hot, its not a good thing..

You may want to get a scan Tool on it and see if there are any codes stored in the PCM.. There may be some other issues happening causing it to go into limp home..