Did they change the filter? AAmco and others now tee into the cooler lines and flush which may stir up things that should not be as they are already passed the filter. Also ask if new fluid was used, I've heard that your old fluid may be filter in the machine and sent back into your trans. It's always best to drop the pan and change the filters.IMO Tom Same goes for these "oil flushing machines" only use as a last resource i.e. knocking lifter noise.
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