I can't believe relatively no one has heard of this thing. I got it here, it consists of a pinion carrier and modified shaft/torque tube (no okie bushing repair necessary now!!!) overdrive unit that connects to the tail end of the tranny, 3 or 4 speed, and the cable with knob to engage, very cool. A co-worker has found an early '50's chevy panel and it has one also!! Theres gotta be more out there.