Not sure if any of these have been posted before or not. Just some transmission/transfer case information and supporting sites that I have found.
Hopefully all who are gear heads can add to this or correct what is incorrect and gear heads/non-gear heads can find some useful information.
Gear ratio calculator: http://www.grimmjeeper.com/gears.html
Tire size calculator: http://www.dakota-truck.net/TIRECALC/tirecalc.html
Manual NSG370, http://www.novak-adapt.com/knowledge/nsg370.htm
Auto (4 speed, 2007-2011) - 42RLE, http://project-jk.com/jeep-jk-write-...ission-service
Auto (5 speed, 2012-????) - W5A580
X/Sport/Sahara: NV241, 2.72:1 low range
Rubicon: NVG241OR, 4:1 low range, http://www.novak-adapt.com/knowledge/np241or.htm
X/Sport/Sahara front: Dana 30 with 3.21 or 3.73 gears (4.10 optional towing package in 07, 08 forward only 3.73 is optional).
X/Sport/Sahara rear: Dana 35 with 3.21 or 3.73 gears (4.10 optional towing package in 07, 08 forward only 3.73 is optional).
Rubicon: Dana 44 with 4.10 gears.