The NHT package was not available with the Denali trim level.
An AWD Denali has the 8.6" 10-Bolt rear differential. They all came with the G80 and 3.42 (GU6) gearing.
The NHT equipped pickups have 3.73 gears and an extra leaf in their rear spring pack and of course different shocks. Their steering rack also has a different part number.
I've got two GMT900 6.2 pickups, one an NHT and the other an All-Terrain Z71. Both are Crew Cabs.
The NHT has an 1,805 pound payload capacity and is rated to tow 10,400 pounds. Her GVWR is 7,300 pounds.
The All-Terrain has an 1,433 pound payload capacity and is rated to tow 9,400 pounds. Her GVWR is 7,000 pounds.
They have both towed way more than this and the powerful 6.2 doesn't even know the load is back there. But, the majority of our towing is done here in Florida where our hills are overpasses and not miles long steep grades.
All 6.2 pickups that are not AWD have the 9.5" 14-Bolt differential with disc brakes.
The brakes on all three of these trucks, including the 5.3 Yukon XL, share the exact same part numbers.
My All-Terrain is bone stock and runs 14.80s in the quarter mile. That glorious 6.2 puts a smile on my face every time I drive it.
If you use the desktop version of AutoTrader and some of the others, you can specify the trim level and 6.2 engine. There are more Silverado LTZs around than SLT Sierras with the 6.2. More LTZ Silverados come with ventilated seats than SLT Sierras.
Most 6.2s in this generation are west of the Mississippi River. Prepare to travel across country for a good one. They are out there, I search for them periodically still. I know of about 4,225 6.2 Sierras made between 2012 and 2013. The NHT CC in 2012 and 2013 totals 900 in SLT trim and 970 in SLE trim. I maintain a spread sheet of course!
This is the sheet I made to help locate them:
View attachment 477577
An NHT equipped truck doesn't show RPO K5L but it has all the features of it.
This is my All-Terrain:
View attachment 477578View attachment 477579
Wait a minute, you're in Kansas, right smack in the middle of 6.2 country! Almost bought one in Olathe and picked up the red one in Oklahoma City with 75K miles on it. The NHT came from Idaho.