Many years ago,I put a 3speed w/OD in my 55 chevy 6 cyl ambulance,my everyday driver.I put a toggle switch on the shift lever where my thumb sat,disconnected the governor,and ran it as a 6 speed,using the toggle switch to go in & out of OD.It worked perfectly for years,really helped fuel economy,& made that heavy rig drive better with the larger selection of gears.HONE OD.,DOUG NASH(became US. GEAR),& GEAR vendors OD. all can run as stand alone units.Only GEAR VENDORS is still in business,but the units are on E-bay all the time,though expensive usually.
