Mine has done this since day one. This is the single most annoying issue about the truck at this point.
It is an RPM for me, right around 1500, but is most noticable in 1st or 2nd gear.
Putting throught the neighborhood is so aggravating.
Any update on this unit? Do you still like it now that you have had it a while?
All the ones I've found on ebay and craigslist don't have the nav and they want as much or more for a used one that FL Trucks does for a new one.