All, recently inherited my grandfather's Magna, a 1998 Solara model with only 35,000kms.

The auto transmission seems to not be able to decide what to do when changing from 3rd to 4th at a speed of about 55-65km/h.

Is this likely to be fixed with a fluid flush/change, or something more likely to be wrong with the transmission. I would have hoped with only 35,000kms on it that nothing major would be wrong.

Thanks,
John

Flush it then do a full relearn.
Probably didn't go over 55 Kph hence the confusion.
Gerry