Hmmm, not sure. The kit they list does include shock extenders & sensor rods. http://www.mcgaughystore.com/2015-gmc-sierra-denali-1500-2wd-4wd-2-rear-leveling-kit/
2015 Sierra Denali 1500 2wd/4wd 2" Rear Leveling Kit
This Kit Is Designed To Level The Rear Of Your 2015 GMC Sierra Denali 1500 2wd/4wd Truck. This will lower the rear of the truck 2".
Includes-
2" Rear Drop Shackles
Rear Ride Height Sensor Arms (Pair)
Rear Shock Extenders
Notes-Works With Magaride suspension
I do personally want to drop & level out the rear, but at the same time want to add bags for when I'm pinned up to the TT.
Which spindles, leafs & shackles did you use Dan? What did you do for adjustable links? Is that Denali you dropped 2WD or 4WD?