Re: Which 4WD system do I have...
Not necessarily, that standard feature was dropped in 2012 I think, perhaps still standard on the Summit. You may need an ORA package.
The 4WD system type gets displayed in the EVIC panel on start up, which may be the easiest way to determine which system you have.
The only difference between the QT II and QD II is the rear differential and some traction control software. A QD II vehicle has the QT II transfer case. The QD will have an electric motor hanging out of the rear differential driver side, the non QD QT II will not.
You can also contact Jeep with your VIN and they should be able to send you a build sheet.
2011 WK2 Overland Mineral Gray/Black, Advanced warning, V8; 2009 KK Rocky Mtn V6; 2000 WJ Laredo I6; 1979 CJ7 I6... green... miles of smiles :)