Granny Gears Too Low..Solutions ?

[Tony]

I have a 68 K10 with the Rockwell 221 and 4 speed.. I thought 68 was the last year for the Rockwell?
1968 Chevy K10 factory information shows the standard axle gear ration as 3.73 with no optional ratios available as original equipment. I will assume 69 is the same but of course the gears might have been changed over the years.
3.73's with typical 235/15 tires is around 2600-2700 rpm at 60 mph. While not the 1400 rpm of a new truck it's not all that much engine speed and you can cruise all day at 65 ...
My 68 with a 250 sounds busy at 60 mph but I pay no attention to and drive on....It's an old truck with minimal or no sound deadening...Not a 2015 Silverado