The major difference between J.E. Reel's new driveshafts and the JK's factory driveshafts is the CV joints. J.E. Reel's 'shafts utilize U-joint technology, while the OE driveshafts use Rzeppa CV joints. The new driveshafts are constructed from 2.75x0.095-inch DOM (drawn-over-mandrel) steel tubing in the rear, and the front 'shafts are made from 2x0.0120-inch DOM steel tubing.