Noisy vibrating shifter

If it is the linkage rods I have seen two kinds of retaining clips used.
A hair pin shaped clip on many factory Mopar shifters & a circular style clip.
The hair pin style will rattle and the circular Hurst clips hold the rods with spring tension
to prevent the rattle.
If it is the shifter box itself it can be tightened up by removing the main sleeve pivot
and shortening a small amount. This allows the box to be pinched tighter while mounting and will take up slop that will cause the rattle. Be careful doing this. If overdone it will be to tight to shift.