I meant with the ARBs open do they act like a detroit, or do they act like a regular dif
Regular diff, locked they are a spool, unlocked open diff.
That rig is not a good choice for a DD and it will take a bunch of work to get it street legal. The on thing I see right away is I doubt the fuel cell is CARB approved so you would fail the SMOG on visual.
It also looks like it is built mostly with Trail Gear parts and their 4-link is not the best design in the world, the numbers are not right on the link specs.
While it looks like it would be a great trail rig, it would suck on the street.
Remember to be a good wheeler it is not the rig, but the driver behind the wheel. Wheeling is 80% driver, 20% rig.