Pretty sure it has 4.57 rear gears. For now. These gears with a non-overdrive tranny and 31 inch tires, 50 to 55 mph would be about right. Mine will be changed out to a later Dana 60 with 3.73's as the last phase of my drivetrain modifications. The goal with my 62 is modern drivability while keeping that "farm truck" look. Check out the link, new update soon.
http://67-72chevytrucks.com/vboard/s...d.php?t=703583