Take a look at:

http://www.classictruckshop.com/clubs/earlyburbs/projects/over/drive.htm

specifically the picture of overdrive electrical system. Put the switch in instead of the governor. Only problem is remembering to turn off the switch when below 23 mph.

Full info also available in standard shop manual for your truck.

Should work fine.


1956 Chevy 3100
261/700r4 (formerly 3 speed OD)
In the Stovebolt Gallery
More pix on Photobucket