The Stovebolt Site Forums The Parking Lot Big Bolts How fast will my truck go?

A few eons ago a buddy bought an a old '50's dodge panel truck and we added an overdrive unit from a similar year car. With that he could get that old flat head really cruising on the highway, with an electric shift he worked it like a 2 speed rear end. Has anyone ever done something similar with a big bolt? Is a there an overdrive made that's tough enough? Would be a cool solution to keep all the low range power but "slide it on down into overdrive" for highway travel. Just a thought from a restless mind...