2.5L inline-6? Yeah that's the 4T65E Hydramatic. The 2.9L got the
Aisin-Warner 50-42LE.
Both work better with filter change 15-20K miles. Of course Volvo (and
other makes) may tell you it's a lifetime fill (not sure in this
case). If so it's good until the end of the tranny's life. At least
that's my interpretation.
I would:
1. Change the transmission filter, wipe clean the pan, inspect the
amount and types of debris in the pan
2. Use a suitable High Mileage ATF (maybe Castrol, check specs) and
maybe a shorter drain/refill interval AGAIN shortly if the fluid is
really dirty. I wouldn't "machine flush" the system when dirty.
But if it already slips then there isn't much other than the above
that you can do. Check with Volvo for goodwill warranty like others
said. You can also check your local Automatic Transmission Rebuilders
Assoc. for a local shop.
Check with Jaspers for a reman 4T65E along with any recommended local
installer (ATRA preferred). All decent reman should have at least a 3-
year/100K mile warranty.
Of course, the moment you mention Volvo the price probably doubles.
http://www.atra.com/
http://www.jasperengines.com/transmissions-automobile.htm
http://www.castrol.com/castrol/sectiongenericarticle.do?categoryId=9018758&contentId=7033928