Have you seen the JK Rubicon rear D44 axle tubes? Went on a site seeing tour of the dealership today and they are huge (looked about like Ford 8.8 tubes), this axle seems to be a very strong D44, stronger than the XJ D44. What I don't like about it is the very low shock mount location, close to the wheel, which is good, but too low. The JK Rubicon front D44 on the other hand has small tubes that look about like the ones on the D30.