Just got a 2011 KK and it has 600 mi on it thus far. I went off-roading in it yesterday and decided to test out HDC on the way back down the steepest part. HDC was really loud and sounded like grinding. It's just the ABS being applied to the wheels in order to keep the jeep at a constant speed right? Nothing is wrong with it, it works great. I was just surprised at how grumbly the darn thing was. Hey, if your Jeep isn't making a painful gear grinding noise, there's prolly something wrong.

Thoughts about HDC?

perfectly normal

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2008 KK Liberty
Inferno Red
Daystar 2" Spacer Lift With SkyJacker Hydro Shocks
JBA Gen 5.5 Upper Control Arms
Rokmen Riddler 8.25 Differential Cover
2 KC Slimlite 100 Watt Driving Lights on JK Light Bar
245/75/16 All Terrains
Mopar Front Tow Hooks
Mopar Rear Tow Hook
Mopar Skids

Normal, my LR3 does the same thing. It's an awesome feeling.

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05 KJ Limited 4x4 in Light Khaki: Detours USA Backbone, Warn M8000, Huskyliners, RockLizard Super Skink sliders, OME/Bilstein Lift, JBA UCA's, 245/70/17 Nitto Terra Grapplers
07 LR3 SE V8
1996 XJ Country
2015 KL Limited