Ok, I know, the truck's one year too old to be asking this question here, but I have a 1968 Chevy 3/4 ton 2wd with a 307 and a 4 spd. We've had this truck for 22 years, it's sat for 8 years, and just last week, I got it on the road again. I had never driven it myself on the highway before, since last time it was licensed was 1994 when I was 13. It felt extremely low geared. I take it 4.10 and 4.56 gears were probably the two most common gear ratios of that era/year?