I searched previous threads and found this:
https://legacygt.com/forums/showthread.php/98-shifting-issue-265155.html?t=265155&highlight=slipping
Opinion was "new tranny", but there was no follow up, so is that the diagnosis and treatment?
My symptoms are just a bit different:
98 Legacy L.
1. Park, Reverse, 1st second good. all proper shift positions. Linkage likely intact.
2. Will slip out of D, mostly going up hills....goes to 1st gear.
3. I find that manually shifting it into 2nd works and gets me to 35-40mph to get up hills.
4. Putting it in D after gaining speed, or when cresting a hill going down, causes it to shift into 3rd and 4th.
5. It will cruise along pretty good for a while, but I can feel it softly shifting 3rd to 4th and back...which is normal, it downshifts on grades, but this seems a bit too frequent.
6. Seems to be WORSE when COLD.
I put a can of 'seafoam tranny sauce' in and it seems to be a bit better, but it is now overfilled.
C