I quote Mike Donoughe, vice president of the Wrangler's body-on-frame product team.
The X and Sahara versions feature the second-generation Command-Trac part-time, two-speed transfer case, featuring a 2.72:1 low-range gear ratio. An optional Trac-Lok limited-slip rear differential provides extra torque and grip during low-traction situations. The top-of-the-line Rubicon comes with an Off-Road Rock-Trac two-speed transfer case with a 4.0:1 low-range gear ratio, as well as electric front- and rear-axle lockers, Active Sway Bar System and 32-inch B.F. Goodrich off-road tires.
Under the hood is a 3.8-liter V6 engine that produces 205 horsepower and 240 lb-ft of torque; it can be teamed with either the standard 6-speed manual transmission or an optional 4-speed automatic. This engine provides more power as well as better fuel economy than the 4.0-liter engine it replaces.
A diesel engine will be available in certain markets outside North America—the first time in a Wrangler.
Wrangler Unlimited will be sold in more than 100 countries throughout the world, in both left- and right-hand-drive configurations, with sales beginning in North America this fall. Available as the X, Sahara or Rubicon, pricing will be announced closer to its on-sale date.
So it sounds like us here in N.A. aren't going to be seeing the diesel off the bat, and yet diesel sales in the Liberty passed all of Jeeps forecasts. Oh well