The Ford Barn - King Pins

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How much, if any, play is acceptable in the king pins on a 40 pickup ? Right side has none, left side has approx. 1/32".

ZERO play is only acceptable as it only gets worse.

Don't disagree with zero play as the objective, but back in the day, the State of Virginia would pass up to 1/16th movement at the top of the tire,

That makes sense as 1/16 at the top indicates almost nothing at the kingpin assuming
the wheel bearings didn't influence the 1/16 finding..

It depends on where the slack is caused. If it is in the axle end, replacing or tightening the lock pins should fix it. If it is in the spindle, it is likely the bushings were improperly reamed. When the bushings are replaced in the spindle, the inside diameter of the bushing is reduced, making inserting the king pin difficult or impossible. They need to be sized to allow a hard hand push. We use our piston pin machine to size them, as a hand reamer often removes too much material. We advise all king[pin bushing to be sized by a machine shop.