Got an '09 Vibe. It currently has 67K. I always hated the 1-2 shift - had car since about 56K. I thought it would maybe slip a little and then shift harder than it should. All other shifts felt fine. I just changed the filter and fluid (3.x quarts)... fixed. I used "WS" (as it says on dipstick) Valvoline trans fluid and don't recall the filter brand. What came out wasn't terrible looking but wasn't "cherry red" either.
I've suddenly become a fan of changing trans fluid. My beloved Honda Ridgeline was having shift problems (all shifts). I followed factory recommendations for changing the trans fluid (not filter) at 35K. At 76K miles all shifts seemed crappy. I changed the fluid (and inline filter). All shifts corrected to what I remember brand new feeling like. For good measure I changed out the fluid a second time to bring up the average amount of new fluid in the trans:
Assuming 12 quarts total..
- after first change, 4 quarts new
- drive it around a while, change it again (4 qts), about 6.67 quarts new - so a little more than 1/2 change out.
I'm thinking the factory recommendations for trans fluid changes are flawed. Maybe it has to do with marketing wanting to manage "cost of ownership" numbers. I don't much pay attention to the engine oil recommendations