repair to any transmission can be costly i would say that it may take up to $2500 for a rebuild unit to be installed or you could rebuild the one that is in it but not recieve a good warranty
It really depends on the services preformed if you only need a filter and fluid change I would say 100- 150 dollars. If it requires the transmission to be removed or rebuilt it would be more like 1500 - 2000 dollars.