U-joint vs pot coupler

...and, I have gusseted my K-frame, have a Borgeson box, and a FirmFeel bearing sector kit to take up excess play in the system. Also, I'm not a rally race or super crazy driver in that regard. My Dart is essentially a cruiser, not much action against my suspension.
That's a good point, the k frames flex like mad, too.

Street cruises are certainly less demanding than some of the stuff we do to these cars!!