We’ve pushed our share of muscular off-road machines. From the Ford Raptor to the uber-lush G Wagen and the Ram TRX, it’s all been enjoyable. However wait, there’s extra. Now there’s a Jeep Wrangler Rubicon with a 6.4-liter monster beneath its hood.
At a look
- Big energy from the large 6.4L engine
- A lot of modifications to accommodate that energy
- Lacking suspension and braking tune for the muscle
- Dear, however value it in comparison with an aftermarket swap
Jeep, Dodge, and Ram have lengthy been buddies, and now that Dodge is prepared to shove large 6.4-liter V8s into something with wheels, it was solely a matter of time earlier than the opposite two received the SRT remedy. With Ram, it was the T-Rex pickup. With Jeep? The Wrangler Rubicon 392.
On its floor, that is only a Wrangler Limitless with the Rubicon package deal into which a 6.4-liter V8 and energy exhaust have been inserted. There’s extra happening than that, although – a automobile able to taking an engine’s torque and changing it to 72:1 on the wheel goes to want some changes when that engine’s torque almost doubles.
Yep. The Wrangler 392’s V8 outputs 470 horsepower and 470 pound-feet of torque (350.5 kW, 637.2 Nm). To account for this quantity of energy going to the wheels, Jeep modified out the Wrangler Rubicon’s … effectively, virtually the whole lot.
The engine mounts to an eight-speed automated transmission and full-time, energetic switch case. That case has low-range gearing at 2.72:1 and is, as implied, engaged full time. More often than not, driving can have the switch case’s shifter in 4 Auto, which defaults to a 30:70 entrance:rear torque cut up for the axles. In 4 Half-Time mode, that cut up turns into 50:50, however biases in direction of entrance axle energy in traction management.
Many elements of the 392 are taken from different fashions within the household. The engine and transmission, for instance, are similar to what’s within the Dodge Durango SRT. The Dana 44 entrance axle with its greater brakes, thicker tubing, and cast-iron knuckles is straight off the Gladiator Mojave mannequin. The Dana 44 rear axle is an identical to the larger-braked model discovered on the electrical Wrangler 4xe. Ultimate drive gearing is 3.73:1 and contains mechanical lockers on each axles.
Going with these additions, Jeep additionally stiffened the framing with strategically positioned stiffeners, modified the entrance crossmember to accommodate the bigger crank pulley of the V8, and used stiffer engine mounts for the larger block. To suit the engine itself, the Wrangler’s physique needed to be raised one other inch so it might clear the engine and transmission’s bulk.
For the reason that massive, throaty V8 can also be thirsty for air (and gasoline), Jeep made modifications to the Wrangler 392’s intakes. The hood, whereas positively a Wrangler clamshell, has a whole lot of Dodge Hellcat in its look, with a much bigger prime consumption and a giant hump within the center for additional supercharger clearance. That hump has “392” emblazoned on both facet. Some secondary consumption ports for backup and airflow allowance are additionally seen. Golden tow hooks, black leather-based for the inside, and another beauty particulars end detailing this as a particular type of Jeep.
One factor Jeep missed, we famous, was suspension tuning. The entrance finish of the Wrangler 392 is heavy, and the suspension bottoms out in laborious off-road driving a lot faster than does the identical setup on the Wrangler Rubicon with its commonplace V6 engine. That tendency to thump, and the off-putting ahead jerk it creates, takes some getting used to. A few of that is as a result of modifications on the rear, the place Jeep moved the rear suspension items an inch away (one inch down for lowers, one inch up for uppers) after which restricted jounce journey by two inches to compensate.
Entrance springs had been elevated by 10 %, however the rear was dropped by 20. The rear roll bar was made stiffer with the intention to compensate and stiffen the chassis on the again. The Tennoco monotubes that include the usual Rubicon package deal had been swapped for monotube Fox 2.0 shock absorbers, which we predict was a mistake. Fox 2.5’s with a reservoir would have been much better, contemplating the burden of this setup.
Jeep additionally appeared to consider braking as an afterthought with this rig. Whereas the brakes are beefier, due to these axle modifications, it nonetheless takes a whole lot of time – we imply a whole lot of time – for the Wrangler 392 to cease after hitting its 100.5 mph (161.7 km/h) velocity limiter. It hits that velocity restrict in about 9 seconds, by the way in which. As long as there’s loads of house to cease after doing 13-second quarter mile sprints, the 2021 Wrangler Limitless Rubicon 392 is a blast to tug. Particularly within the dust. Oh, and also you’ll have to produce your individual launch management. It doesn’t include that. Use your toes.
As a substitute, the Jeep Wrangler 392 comes with the identical loopy good off-road functionality as its different Rubicon brethren. It’s most snug in dust, on rocks, and fording by means of streams. On pavement? Not a lot. As the favored Jeep saying goes, “It’s an off-roader first, a freeway driver … possibly fifth.” The gist? Don’t go attempting to race monitor the Wrangler 392. You’ll flip it over.
Off the pavement, although, we had a beautiful time within the 392. It’s an attractive machine for traversing our favourite harsh terrain and it reminds us, as is predicted of a Wrangler Rubicon, why these harsh paths by means of the wilderness are referred to as “Jeep Trails” within the vernacular.
In the long run, the 2021 Jeep Wrangler 392 isn’t for everybody. And even most. It’s for fans who love the sound of a throaty V8, need all the energy on the planet at their command at any time, and who love high-speed off-road journey. The muscle of the V8 is nice when tackling harsh terrain, however requires some nuance and management at sluggish speeds.
Pricing for the 2021 Jeep Wrangler Limitless Rubicon 392 begins at US$74,995. That’s steep, however not when you think about what it prices to do an aftermarket swap with a 6.4L crate engine.
Product Web page: 2021 Jeep Wrangler Unlimited Rubicon 392