The speedo cable is non-existent so couldn't really tell you. If I had to guess though I would say right around 35MPH. It felt like the most comfortable speed for the truck without becoming TOO Loud. Not to mention the front end still has quite the play in it. Like you said, they are low geared and our backroads are quite bumpy out here so that had a role in the drive. Anyone close to southeast Michigan? I wouldn't mind driving a little ways to see someone elses big bolt and possibly going for a ride to see how it compares. There is currently no bed on the truck, but I have plans drawn up for a stake bed to be put on. Has a PTO but I doubt I'll ever do anything with that.