It is a closed driveline, the arm that the cable attaches too looks a little like a boomerang. It came from colorado, and has a 4 spd transmission w/ a 216 engine. The cable goes from the tranny to the bottom of the dash right next to the steering column but it has no knob on it. Several people have told me that the overdrive only came on open drivelines, and they have found it strange too be on a closed driveline.
