What's the advantage of the hex conversion? Just ability to rotate tires?
Had nothing but troubles when I ran either the Proline or JC hexes on my SC10 2wd when I had it. No issues up front but had issues in the rear. Couldn't tighten down the rear lock nuts very tight as it would cause binding. But leaving it loose would cause the wheel to come off. I tried axle shims but no help. Went back to pins and never any issues. That's why I haven't converted my B4.1 or T4.1. Just my experience that's all.