Caravan transmission question

Hi,



I am looking to buy a Dodge Caravan about 97-99. I heard that the
transmission is very expensive part and don't want to be surprised after
purchasing. So my question is what is the average life time for an elect
trans on dodge caravan? Is there any way to test trans by a mechanic to make
sure there is no problem with it?



I actually have the same question about engine and any advice gratefully
appreciated.



Rob