Rubicon's 5-inch shackles provide an additional 1/2-inch lift over the stock shackles and rotate the front and rear pinions slightly upward. The rear still requires shims to alleviate driveline angles, though. With the 1-inch drop T-case spacers and the supplied 2.5-degree rear shims, we were able to drive the YJ with the factory rear shaft, although we did have vibration when decelerating or coasting. We've ordered some of Rubicon's steel degree shims (available in 4-, 6-, and 8-degree increments) for when our CV rear driveshaft happens. Tune in for more info on that next time.