http://cgi.ebay.com/ebaymotors/Baldwin-M...139135339QQrdZ1
from the ad:
"Nice vintage hone o drive overdrive unit from the late 60s early 70s.This was the od that Joel Rosen of motion performance would put behind the infamous camaros and phase 3 corvettes to off set the 4.88 rear gears for the strip.Shift the floor mount lever and you would have a 30% overdrive for the highway.Very slick unit in great shape.This deserves to be under a motion supercar,and would finish off an authentic motion restoration.Sold as is and auction is for od unit and attached shift arm.Comes with copy of hone overdrive catalog and Motion performance catalog page with hone o drive advertisment."