73duster steering shaft

Thanks. Should there be a roll pin in it? Currently there is not.
Well yeah, But.... Knowing the aftermarket, it may not be made well enough to get pin(s) in. Geometry between master splines, pin relief, and drilled hole has to be perfect. Other members have that same coupling. They might respond to whether they got pins in theirs or not.
Chassis flex and subsequent movement should be inside/absorbed by the box coupling. Pin(s) prevent any linear movement at the splines.