The Jeep Wrangler IV Unlimited (JL) Rubicon 6.4 392 V8, produced from 2020 to April 2023, represents a high-performance iteration of the fourth-generation Wrangler (JL). This variant aimed to blend the Wrangler’s legendary off-road capability with substantial on-road power, appealing to enthusiasts seeking a unique combination of ruggedness and speed. Positioned as the top-tier performance model within the JL lineup, it sat above trims like the Sahara and Sport, offering a significant upgrade in engine output and overall capability. The 392 designation refers to the engine’s displacement in cubic inches (6.4 liters), a nod to Jeep’s heritage and high-performance models.
Technical Specifications
| Brand | Jeep |
| Model | Wrangler |
| Generation | Wrangler IV Unlimited (JL) |
| Type | Rubicon 6.4 392 V8 (470 Hp) 4×4 Selec-Trac Automatic |
| Start of production | 2020 |
| End of production | April, 2023 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Off-road vehicle |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 18.1 l/100 km (13 US mpg, 15.6 UK mpg, 5.5 km/l) |
| Fuel consumption (extra urban) | 13.8 l/100 km (17 US mpg, 20.5 UK mpg, 7.2 km/l) |
| Fuel consumption (combined) | 16.8 l/100 km (14 US mpg, 16.8 UK mpg, 6 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 60 mph | 4.5 sec |
| Weight-to-power ratio | 4.9 kg/Hp, 203 Hp/tonne |
| Weight-to-torque ratio | 3.6 kg/Nm, 275.2 Nm/tonne |
| Power | 470 Hp @ 6000 rpm |
| Power per litre | 73.2 Hp/l |
| Torque | 637 Nm @ 4300 rpm (469.83 lb.-ft. @ 4300 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | HEMI |
| Engine displacement | 6424 cm3 (392.02 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103.89 mm (4.09 in.) |
| Piston Stroke | 94.49 mm (3.72 in.) |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Engine oil capacity | 6.3 l (6.66 US qt | 5.54 UK qt) |
| Coolant | 11.4 l (12.05 US qt | 10.03 UK qt) |
| Kerb Weight | 2315 kg (5103.7 lbs.) |
| Max. weight | 2767 kg (6100.19 lbs.) |
| Max load | 452 kg (996.49 lbs.) |
| Trunk (boot) space – minimum | 784 l (27.69 cu. ft.) |
| Trunk (boot) space – maximum | 1909 l (67.42 cu. ft.) |
| Fuel tank capacity | 81 l (21.4 US gal | 17.82 UK gal) |
| Permitted trailer load with brakes (12%) | 1588 kg (3500.94 lbs.) |
| Length | 4785 mm (188.39 in.) |
| Width | 1875 mm (73.82 in.) |
| Height | 1892 mm (74.49 in.) |
| Wheelbase | 3007 mm (118.39 in.) |
| Front track | 1636 mm (64.41 in.) |
| Rear (Back) track | 1636 mm (64.41 in.) |
| Ride height (ground clearance) | 262 mm (10.31 in.) |
| Minimum turning circle (turning diameter) | 12 m (39.37 ft.) |
| Approach angle | 44.5° |
| Departure angle | 37.5° |
| Ramp-over (brakeover) angle | 22.6° |
| Wading depth | 825 mm (32.48 in.) |
| Drivetrain Architecture | All wheel drive (4×4). ICE drives rear wheels, front wheels engaged via clutch. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission |
| Front suspension | Coil spring, Rigid axle suspension |
| Rear suspension | Rigid axle suspension, Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Electric Steering |
| Tires size | 285/70 R17 |
| Wheel rims size | 7.5J x 17 |
Powertrain & Engine Architecture
The heart of the Rubicon 392 is the 6.4-liter (392 cubic inch) HEMI V8 engine. This naturally aspirated engine, internally designated as the 6.4L HEMI, produces 470 horsepower at 6000 rpm and 470 lb-ft of torque at 4300 rpm. It utilizes a cast iron block, aluminum cylinder heads, and a multi-port fuel injection system. The engine features a pushrod valvetrain (OHV) and incorporates Chrysler’s Fuel Saver Technology (cylinder deactivation) to improve fuel economy during cruising. The engine is longitudinally mounted in the chassis. The engine is paired with an eight-speed automatic transmission (8HP75), known for its smooth shifting and wide gear ratio spread. This transmission is a staple in many Chrysler and Jeep vehicles, offering both efficiency and performance. The Selec-Trac full-time 4×4 system allows the driver to shift between 2WD, 4WD Auto, 4WD High, and 4WD Low, providing versatility for various terrains.
Driving Characteristics
The 392 Rubicon delivers a dramatically different driving experience compared to the standard Wrangler engine options (like the 2.0L Turbo or the 3.6L Pentastar V6). The substantial torque output of the V8 provides effortless acceleration and strong pulling power, especially noticeable when off-roading or towing. The 0-60 mph time of around 4.5 seconds is significantly quicker than other Wrangler trims. The eight-speed automatic transmission is well-tuned to the engine’s characteristics, providing smooth and responsive shifts. While the added weight of the V8 engine slightly impacts handling compared to lighter Wrangler models, the robust suspension and wide track width maintain a stable and controlled ride. The Selec-Trac system allows for seamless transitions between 2WD and 4WD, enhancing on-road comfort and off-road capability.
Equipment & Trim Levels
The Rubicon 392 came standard with a comprehensive list of features, building upon the already well-equipped Rubicon trim. Standard equipment included heavy-duty Dana 44 axles, a Rock-Trac 4×4 system with a 4:1 low-range gear ratio, electronic sway bar disconnect, and 33-inch all-terrain tires. Inside, the Rubicon 392 featured leather upholstery, heated front seats, an 8.4-inch touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, and a premium sound system. Optional extras included a power-dome hood, bronze-colored accents, and various off-road accessories like a winch and rock rails.
Chassis & Braking
The chassis of the Rubicon 392 is largely similar to other JL Wranglers, featuring a high-strength steel frame and solid front and rear axles. However, the 392 benefits from upgraded components to handle the increased power and torque. The suspension utilizes coil springs and heavy-duty shocks, providing excellent articulation and off-road performance. The braking system consists of ventilated discs at all four corners, providing ample stopping power. An Anti-lock Braking System (ABS) is standard.
Market Reception & Comparison
The Rubicon 392 received generally positive reviews from automotive critics. Praise was directed towards its powerful engine, impressive acceleration, and exceptional off-road capability. However, the fuel economy was a common criticism, with the combined fuel consumption of 14 mpg being significantly lower than other Wrangler trims. Compared to the 3.6L V6 Wrangler, the 392 offered a substantial performance upgrade but at a higher price point and with reduced fuel efficiency. Compared to the 2.0L Turbo, the 392 provided a more traditional V8 experience with more raw power and a distinct exhaust note.
Legacy
The Jeep Wrangler JL Rubicon 392 represents a unique chapter in the Wrangler’s history, offering a rare combination of extreme off-road capability and V8 power. While its production run was relatively short (2020-2023), it has quickly become a sought-after model in the used car market. The 6.4L HEMI engine is known for its reliability, and the Rubicon 392’s robust construction ensures its longevity. As a result, well-maintained examples are expected to hold their value and remain popular among Jeep enthusiasts for years to come.
