Welcome to the board,
Since most AD were built to accomidate the typical speeds of 45-50, you will not find anything totally stock that will travel at today's modern highway speeds. Thus you will either get a truck (GMC or Chevy 1/2 ton) which the previous owner has already improved the gearing by either putting in 3:55 gears into the stock enclosed driveline rear end, or has replaced the enclosed driveline with an open driveline and a newer rearend with tranny that combined has higher gears for faster driving.

I'm still driving with enclosed driveline and 4:11 gears, traveling at a top speed of around 55. Soon I will be installing Patrick's 3:55.

Anyway, you'll find lots of info here on the bolt. Go to search and explore.....


Craig

My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear
My truck ....... Respect The Rust
If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.