Brand New 7290 U-Joint Failure

pishta said

@Locomotion How does this stay "in compression" during operation....
View attachment 1715711847
I'm guessing the driveshaft (pictured) would be turning this setup CW (facing the pinion yoke)..and not be correct? Ie drive force is pulling the weakened zerk fitting side apart? This one seems *** backwards!

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Yes, the driveshaft connected cap should be turning towards the grease fitting. But even those with a fitting in the cap should be avoided for performance use/abuse because they are also cross-drilled to permit grease to reach all 4 caps. As has been mentioned, the non-servicable u-joints that are solid inside, factory greased & sealed should be used. I've seen solid u-joints called "Brute Force", or something like that, but you can tell the difference if you have a Spicer solid on hand to compare it to. I don't believe they make a 7290 solid. You might also get into a fitment issue with the yoke ends because Mopar has some driveshaft diameters that don't have aftermarket ends to match. That's why some of my driveshafts have a 7260/1330 combo for the yoke/driveshaft.