Ron, drag racing I take it you mean? I would stay link pin every time then, for circuit racing or track days, a ball joint wins on better trailing arm rigidity, it's a lot of work changing frame heads just to go ball joint, also the link pin is better for running very low.
Thanks for he feedback. What particulay makes the link pin better for straight lining over the ball joint spanners ? I notice most of the tube chassis car run link beam or strange struts
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Whatcha building Ron??
something very short Kev