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2004 Buick LeSabre Question: Sometimes, when my car is fully warmed up, it will up-shift harshly. Why?



, Waupaca, WI, March 10, 2014, 23:57

It does not always do this. It may go days before it does it from one time to the other. Only when it gets warm from a lot of stop and go. I had the filter and fluid changed 3 months ago and it seemed pretty good for a month, then in the second month it did it again, only for a couple of days, then back to normal. Today it did it again. Just can't figure that out.

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  • Answer #1

    G. T. Service Center (4246 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG March 11, 2014, 00:11

    I use BG Trans Conditioner with my trans service. Just changing the filter leaves half or more old fluid still in the transmission, so the conditioner helps with the old fluid. Changing it again would not hurt, you can get rid of some more old fluid.

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  • Medium-star Best Answer
    Greg's Orange Auto (15380 Answers) , Orange, CA - (714) 361-9386
    globalhelper March 11, 2014, 08:58

    seek a free diag from aamco

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