Trans Tune for 2005 Buick Park hard shifting [SOLVED]

I have a 2005 Buick Park Avenue with periodic hard shifting issues. Did a fluid and filter change which didn’t really help anything and no real amount of debris seen in the pan. Then learned of Trans Tune. I added a bottle of Trans Tune to the transmission. I do notice things being better than they were but not all the way better where they should be. Question: would doing another transmission fluid and filter change another time or two with using another Trans Tune treatment at each one improve things? Thanks.

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Jim D.
Jim D.
5 months ago

Yes, it could (provided that you do not have a check engine light on with transmission code P1811-Max Adapt/Long Shift). If you do not have any codes, you can try a fluid and filter change with a can of Sea Foam Trans Tune. Otherwise if you do have a code, we recommend bringing it to a certified mechanic to have it diagnosed.