I'm betting the noise is coming from the pivot in the shifter , pull the boot up and see if there is a bolt to snug up or a way to get a washer or some plastic isolater in there.
I just built a shifter for my van and it's pretty basic how they function
I have 120k on my 2003 Sportsmobile 4x4. I too have been irritated with the rattle, but not thinking much about a mechanical failure or mis-adjustment I simply looped my baseball caps(2) over the knobs and it seems to stop the rattle enough not to notice. Another fix I have used is a small strap that I can tighten if necessary.
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Stan Richards
2003 EB-50 7.3 PSD SMB 4x4
Hey Steve,
Did not read all the replies so my answer may have already been mentioned.
Anyway, I have the same issue in my 2010 EF350 EB. After much analysis and thought I figured a rather technical fix. I wedge a tennis ball between the levers. Problem solved!