With more power and efficiency, the 2012 Jeep Wrangler is demanding more attention towards it. The vehicle has eventually received the Chrysler 3.6 liter Pentastar V6 engine by replacing its 3.8 liter V6 engine.

The engine is equipped with a five speed automatic transmission, a boost from its old four-speed automatic. Basically, the company wanted to move ahead from 4-speed to 5-speed. However, this jump is taken quite late since many automakers are now upgrading their vehicles to seven and eight speed transmissions.

Despite its choice, the powerplant of 2012 Wrangler will be the same as the units in the 2011 Grand Cherokee. At the current year’s Jeep Grand Cherokee, its 3.8 liter engine delivered 202 hp and 237 lb-ft of torque whereas, its upgraded engine, 3.6 liter Pentastar has easily accomplished 290 hp and 260 lb-ft of torque.

A spokeman for the Jeep Brand, Todd Goyer has indicated that the Pentastar will be the standard engine of all vehicles and its 4-speed automatic will be replaced with 5-speed automatic. The powertrain will help to enhance the fuel economy ratings of the Wrangler which were rated this year at 15 miles per gallon, 19 mpg city. With this upgrade, the ratings will increase to 16 and 23 mpg.

Enthusiasts will not be so happy to hear that this current vehicle lacks sufficient power and torque due to its heavy weight, especially the 4-door unlimited model. Where the 2011 Wrangler Rubicon’s curb weight estimates at 4,460 pounds, the new Grand Cherokee weighs some additional 200 pounds.

By Sunita Mandal


  1. Sunita your information is not that factual. Do some more research. The JGC uses the 3.6 pentastar at the moment and has a hell of a lot of power. The V6 will do plenty good in the Wragler.

  2. All this upgrade and the 2012 Wrangler is only expected to get one more mile per gal city?
    Doesn't sound like much of an upgrade unless we see a vast power difference. I sure don't see it in the new GC. I test drove the new pentastar. It makes a lot of noise but seemed slow and sluggish. The computer showed that it was still only getting 14 MPG.


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