Yeah that’s seem like an ok but deal for what you get plus you can always resell the Detroit if you don’t end up using.

If he ran all the hard Colorado trails over 3 years on 38’s I would inspect the case, gears, Detroit for wear.

FYI the CALMINI kit isn’t designed for flattops with cross over partial high steer as described. Not to say you can’t use them but you’re going to have to customize/experiment some to use the kit if it works out with that type of setup. Otherwise you can pick-up a stock waggy drag-link, tie-rod,etc and most likely use those knuckles with nothing attached to the flap-tops.