Quote: Don't most u-joints are going to break at the initial hit, not at speed? I guess you could damage it and have it hold on for a while.
Not all of them. Many years ago I had a U-joint come apart just when I let off the throttle during a long overtaking action at the highway at a 'good rate of speed' (read: 100-110mph)... The U-joint 'failure' could be traced back to my own stupid installation fault at the time, but luckily the driveshaft didn't entirely break loose from the transmission. The final result was a wrecked transmission with bend outputshaft and a carbottom covered in ATF.
