I have a 2005 Buick LeSabre and it shutters when it shifts into 2nd gear.
2 Answers
The first and easiest thing to do is have the transmission fluid changed. There is no guarantee that this will solve the problem but quite often owners never change the fluid and most manuals suggest changing it around 40-50K miles
I changed it and it still did it, so I added Lucas oil trans additive. And it still does it.
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