I just looked it up on the online ordering guides. For the Yukon the 2 speed transfer case comes with and is only available with the heavy duty trailering package or the Z71 off road package. AWD on the Denali. http://eogld.ecomm.gm.com/NASApp/do...vehicleID=12764§ion=oi_def&page=6&butID=3
For the Tahoe it only comes with the heavy duty trailering package or Z71 package and is standard on the LTZ model. http://eogld.ecomm.gm.com/NASApp/do...vehicleID=12744§ion=oi_def&page=6&butID=3 It was also this way when I ordered my 2011 LTZ in mid 2010.
I would get the heavy duty trailering package even if you don't tow to get the 3.42 gears.
For the Tahoe it only comes with the heavy duty trailering package or Z71 package and is standard on the LTZ model. http://eogld.ecomm.gm.com/NASApp/do...vehicleID=12744§ion=oi_def&page=6&butID=3 It was also this way when I ordered my 2011 LTZ in mid 2010.
I would get the heavy duty trailering package even if you don't tow to get the 3.42 gears.
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