Ok so just to update. I got my diff back with the 3.58 gearset. It was a new set (they didn’t have any used, and new was only 15$ more) from Nitro Gear, so I am breaking them in. Cruising speed is about 200-300 rpm lower, so that’s nice. It builds boost in 2nd a little better, too. I’ll flog on it more once it’s broken in. So far, I am happy with it.