We'd never run a set of chromoly shafts with standard U-joints. That combination is just asking for trouble because if the joint breaks it'll wipe out the shaft too. A set of CTM Racing 300M joints proved indestructible in our Ultimate Avalanche, so we weren't going to run anything else in our new truck. Thanks to the CTM's larger cross and pin diameter they have more strength for high-stress applications like ours. The CTM joints also eliminate the failure-prone needle bearings and replace them with a bronze sleeve. In our experience the sleeves show very little wear when greased regularly.