My '46 6400 is still 6v and will probably stay that way. I converted one of my farm tractors because everyone said that was the way to go, but it would have been easier to just replace the corroded battery cables. Granted the engine cranks faster than it idles, but my other tractor starts just as well on 6v as does the truck. The only downside I see is trailer lights, but most towing is done with my modern van.
