2012 Jeep Wrangler Review
Jeep introduces the all-new 3.6-liter Pentastar V-6 petrol engine that will be equipped on the 2012
Jeep Wrangler and Jeep Wrangler Unlimited. 3.6-liter V-6 powertrain provides more fuel efficiency,
improved on-road driving dynamics and refinement, more power and more torque. Petrol
powertrain now adds upgraded automatic transmission for refined shifting and greater
performance. Dramatically improved on-road performance combines with even more off-road
prowess. New petrol engine joins 2.8-liter turbo diesel engine for European lineup.
In Europe, the all-new 3.6-liter petrol powertrain will be introduced on Jeep Wrangler and Jeep
Wrangler Unlimited Sport, Sahara and Rubicon trim levels starting November 2011.
3.6-liter Pentastar V-6 Engine
Compact and lightweight, the all-aluminum 3.6-liter Pentastar V-6 engine is more than 40 kg (90 lbs)
lighter than the previous 3.8-liter V-6 engine that was constructed with a cast-iron block. The
Pentastar engine is extremely quiet, constructed with a high-pressure, die-cast aluminum block
fitted with cast-iron bore liners and aluminum cylinder heads. The engine also has been designed to
meet all known future worldwide emission standards and is currently Euro 5 certified.
The 3.6-liter V-6 engine is manufactured at the Trenton engine plant in Michigan (USA).
The A580 automatic transmission benefits Jeep Wrangler as much as the new petrol engine, with
more refined shifting and gear selection. By increasing the number of speeds, the transmission
allows the engine to operate in a more efficient RPM range, which helps increase fuel economy.
More speeds also enable the engine to remain in the torque curve, increasing acceleration. The new
Wrangler (two-door) boasts a 37-percent improvement in 0 - 100 km/h time, which is now 8.1
seconds. Also, a lower first-gear ratio in the new automatic transmission gives the Wrangler more
off-road capability via a lower overall crawl ratio.
Electronic Range Select is standard for all automatic-equipped Jeep Wrangler models. The electronic
stability control (ESC) also has been optimized to perform effortlessly with the new 3.6-liter V-6
Along with the proven NSG 370 six-speed manual transmission, engineered for the newest Jeep
Wrangler are a new clutch housing, flywheel and long-travel damper clutch. The improvements are a
result of the adaptation of the transmission to the 3.6-liter V-6 engine.
The five-speed automatic transmission is produced in Kokomo, Indiana (ITP2), and the six-speed
manual transmission is produced in Gaggenau, Germany.
Jeep Wrangler delivers unmatched off-road capability with legendary four-wheel drive and is
produced with more than seven decades of 4x4 engineering experience behind it. Wrangler
continues to offer a body-on-frame design, front and rear five-link suspension system, live axles and
Jeep Wrangler now offers a choice of two transmissions: a six-speed manual and a five-speed
Along with a new powertrain, Jeep engineers have thoroughly optimized ride and sound
characteristics of the Jeep Wrangler's body-on-frame design. New motor and transmission
adaptations and revised suspension calibrations contribute to overall improvements that are
immediately evident both on- and off-road.
The interior sound quality is greatly improved through refinements in the powertrain mounting
system, noise damping in the firewall and the inclusion of the first Jeep Wrangler engine cover to
effectively isolate the cabin from noises emulating from the engine and road surfaces.
On the outside, engine noise is barely perceptible at idle. With the new 3.6-liter V-6 engine, all
accessories are mounted directly to the engine with no accessory brackets. This helps ensure that all
accessories, including the power steering pump, alternator and air conditioning compressor, are
anchored firmly and less susceptible to vibration and noise.
Shocks have also been retuned and are designed for optimum balance between advanced on-road
handling and rugged off-road capability.
Axles and Transfer Cases
The Jeep Wrangler is now available with more axle gear ratios, allowing customers to optimize fuel
economy and/or vehicle capability. Wrangler is available with 3.21, 3.73 or 4.10 ratios depending on
model. Also, Jeep Wrangler offers towing capability up to 2,500 kg.
The capable driveline of the Sport and Sahara models includes a Dana 30 front axle and Dana 44 rear
axle. The Command-Trac® NV241 part-time, two-speed transfer case features a 2.72:1 low-range
The Rubicon model features heavy-duty Dana 44 front and rear axles and the Rock-Trac® NV241
two-speed transfer case with a 4.0:1 low-range gear ratio. Rubicon also includes electric front and
rear locking differentials and disconnecting front sway bar, taking Jeep Wrangler to the highest level
2.8-liter CRD Engine
The all-new 3.6-liter V-6 engine joins the new 2.8-liter turbo diesel engine with fuel-saving Stop/Start
technology. The diesel engine provides power of 200 hp DIN (147 kW), a 13-percent improvement
over the prior 2.8-liter diesel engine. Torque for the engine comes in at 410 N•m (302 lb-ft) with its
six-speed manual transmission and 460 N•m (339 lb-ft) with its five-speed automatic transmission.
Jeep Wrangler's diesel engine, when paired with the manual transmission, incorporates Stop/Start
technology - the first application of this technology on a Chrysler Group vehicle. Stop/Start improves
fuel efficiency and reduces CO2 emissions by managing the amount of time the engine runs. With
Stop/Start, the engine is shut off when the vehicle is stopped, the shift gear is in Neutral and the
clutch is released. The engine then restarts automatically when the clutch pedal is depressed.
Drivers can deactivate the technology via a button on the dashboard, and an icon displays in the
instrument panel to indicate the Stop/Start status.