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The variety and shape of solenoids used in modern transmissions changes with each new model. On any rebuild, solenoids are a suspect part and should either be tested and verified for proper operation or replaced. Some shops opt to just replace all the solenoids on the valve body.

Of course, any failure will make itself visible by the corresponding manifestations, so the driver will be able to start the process, carry out required repairs without going to extremes, waiting until the need for complete replacement of parts arises.