I guess this is to be expected. In my 1966 Chevrolet stepside p/u, the speedometer now doesn't work with the new 4 speed OD transmission. I'm still using the original 3 speed tranny cable.

I said the speedometer "doesn't work" but that's not exactly accurate. It works but doesn't register the correct speed. It wavers around all over the place. Do I need to replace the speedo cable? Get a new speedometer from a mid 80s truck? Or what?

-ftyler