Mark Rosenbaum
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The overdrive solenoid should work off +12 volts. Ideally you would use two switches to control it: one on the dash or shift knob, with power supplied by the ignition switch. The output of this switch would feed a 3rd/4th gear switch mounted on the transmission linkage cover (this is directly opposite the backup lights switch). The output of this second switch would go directly to the solenoid.
This arrangement prevents damage to the overdrive from excessive torque in the lower two gears.
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