Daystar JK arms are adjustable so we can adjust for caster and lift height. J.E. Reel CV driveshafts are strong and perfectly balanced. There are no driveline vibrations in either Jeep. The front Dana 44 on the JK is reverse-cut with the pinion up high out of harm's way. The front 44s have 30-spline inner axles, but 32-spline outers with big U-joints. Burnsville had the axles machined so full-circle C-clips could be used. The only problem with the JK is that the half-circle C-clips work their way out, letting the U-joint cap fall out. With the U-joint rattling around in the ears, the axle breaks. We had no problems at all with our 37-inch tires on the stock axles with the full-circle clips.