I was referring to a healthy-sounding low gearing whine when in low-low while climbing a long obstacle with a fair amount of RPM’s. Such as you might do when you don’t want to lose momentum. In addition to 4.88’s I have the transfer case low range reduction. Perhaps it’s the combination of both. Imho, it’s an ideal setup that allows more control offroad and better drive-ability on road.
I also have a slight touch of what you described as well. Maybe above 50 mph. Not enough that it’s distracting but it’s there if you listen. Mine where installed by Christo/whoever Christo uses to set up gears.
Couldn’t be happier unless I had one of Joey’s turbos.