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"The final thing to avoid that can immediately damage the overdrive is
to reverse or start in first gear while overdrive is engaged. This will
instantly crush the needle bearings inside the sun gear and require a
several hundred dollar repair.
Fortunately, this mistake is only
possible if you bypass electrical circuits by connecting the solenoid to
the overdrive toggle switch, removing the kick down switch, relay, and
governor from the circuit. This is not a factory installation, but some
car owners have done this over the years, and most end up later paying
the repair cost as a result."