Shift Solenoids A and B for the 4l60e (1993-up) are identical and interchangeable. Sometimes this is helpful to diagnose if one is faulty; senors can be swapped to see if undesired shift characteristics move with the solenoid. Keep in mind shift solenoids for the 4l60e are one of the least expensive parts on these units, and the cost of replacing ATF every time the pan comes off is significantly higher. With that said, shift solenoids should be replaced with every build and whenever suspected guilty.
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