Chevy Impala Forums - View Single Post - 09 Intermittent Transmission Harshness
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post #2 of (permalink) Old 06-30-2019
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The "flush" will stir up the particles in the trans. Some of the particles are ferrous material which will stick to the magnetic part of the solenoids so they don't operate correctly. Changing the solenoids probably will fix the problem but is labor intensive.
Dropping the pan and changing the filter usually works better.
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