We sent our rear Tom Wood's double cardan shaft back to the company to have it shortened. We're conducting long-term testing on Wood's proprietary cold-forged CV and Gold Seal U-joints and have racked up about 20,000 miles on the rear shaft thus far. Up front, we had Wood build us a new 1310 driveshaft, which for the money is one of the bargains of the 4x4 world. It's super-strong, loaded with the company's excellent Gold Seal U-joints, and is balanced for high-speed use. In fact, it rid our Jeep of a vibration at freeway speeds that must've been coming from the stock front shaft.