What Engine Is in the Jeep Gladiator? Complete Specifications and Options
The Jeep Gladiator features a 3.6-liter Pentastar V6 engine as its standard and current powertrain. This naturally aspirated gasoline engine delivers 285 horsepower and 260 pound-feet of torque, paired with an 8-speed automatic transmission. For 2026, Jeep is introducing a 6.4-liter Hemi V8 option in the Rubicon 392 variant, marking a significant performance upgrade for those seeking raw power alongside off-road capability.
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Current Standard Engine: 3.6L Pentastar V6
The 3.6-liter Pentastar V6 has served as the Gladiator’s primary engine since its 2020 debut. This proven powertrain combines reliable performance with practical efficiency for the midsize truck segment.
Engine Specifications:
- Displacement: 3.6 liters (220 cubic inches)
- Configuration: V6, naturally aspirated
- Horsepower: 285 hp @ 6,400 rpm
- Torque: 260 lb-ft @ 4,400 rpm
- Valves: 24-valve DOHC (dual overhead cam)
- Fuel System: Sequential multiport fuel injection
- Fuel Type: Regular unleaded gasoline
Performance and Capability:
The V6 delivers responsive power across various driving conditions. Factory testing shows 0–60 mph acceleration in approximately 7.2 to 8.3 seconds, depending on trim and transmission configuration. Top speed reaches 97–98 mph, limited by the electronic governor.
On highway fuel-economy routes, automatic-equipped models achieve 21 mpg at 75 mph. EPA ratings stand at 17 mpg city, 22 mpg highway, and 19 mpg combined with the 8-speed automatic. Manual transmissions—discontinued after 2024—provided slightly better highway figures at 23 mpg.
Towing and Payload:
With the available Max Tow Package and 4.10 rear axle ratio, the Gladiator reaches its maximum towing capacity of 7,700 pounds, the highest in the midsize truck class. Without this package, base models tow 4,500 pounds. Payload capacity ranges from 950 pounds on lower trims to 1,725 pounds on Sport models equipped with the appropriate axle ratio, delivering genuine utility for work and adventure.
Engine Technology:
The Pentastar features engine stop-start (ESS) technology, automatically shutting off the engine during idle stops to reduce fuel consumption. Variable valve timing (VVT) optimizes power delivery and efficiency across the RPM band. The aluminum block and heads keep weight manageable while dissipating heat effectively.
Jeep Gladiator Engine Specifications Comparison
Discontinued Engine: 3.0L EcoDiesel V6
Jeep offered a turbocharged 3.0-liter EcoDiesel V6 from 2021 through 2023, providing a torque-rich alternative for buyers prioritizing fuel economy and low-end grunt.
Engine Specifications:
- Displacement: 3.0 liters
- Configuration: V6, turbocharged
- Horsepower: 260 hp
- Torque: 442 lb-ft @ low RPM
- Transmission: 8-speed automatic only
- Fuel Type: Diesel
Performance:
The diesel excelled in real-world efficiency. Testing showed 27 mpg on the 75-mph highway route—significantly better than the gas V6. EPA estimates were 22 mpg city and 28 mpg highway, with a combined rating of 24 mpg. This efficiency advantage made diesel particularly appealing to long-distance drivers.
The EcoDiesel’s 442 pound-feet of torque, 182 more than the V6, provided confident hauling and towing. Maximum towing capacity reached 6,500 pounds, slightly below the gas engine’s peak but adequate for most trailers.
Why It Ended:
Jeep discontinued the EcoDiesel after 2023, citing a strategic shift toward electrification. The parent company, Stellantis, faced pressure following emissions-related settlements with the EPA, making the continuation of diesel options less attractive from a regulatory risk standpoint. Additionally, the \$6,000 price premium limited buyer adoption, making the investment unprofitable. Used diesel Gladiators (2021–2023 models) remain desirable in the secondhand market due to their fuel efficiency and torque characteristics.
Upcoming Engine: 6.4L Hemi V8 Rubicon 392
For 2026, Jeep confirmed the arrival of a 6.4-liter Hemi V8 engine in a new Gladiator Rubicon 392 model. This represents the first factory V8 option for the Gladiator lineup and mirrors the success of the Wrangler Rubicon 392.
Expected Engine Specifications:
- Displacement: 6.4 liters (392 cubic inches)
- Configuration: V8, naturally aspirated
- Horsepower: 470 hp
- Torque: 470 lb-ft
- Transmission: Anticipated 8-speed automatic
Significance:
The 392 delivers a dramatic performance leap. The 185-hp increase over the standard V6 transforms the Gladiator into a high-performance truck capable of genuine speed and acceleration. The equal horsepower and torque figures (470 hp, 470 lb-ft) reflect the raw power this engine provides.
In the Wrangler Rubicon 392, this engine accelerates from 0–60 mph in approximately 4.0 seconds and runs the quarter-mile in 12.8 seconds at 104 mph. Similar performance is expected for the Gladiator variant, though the pickup’s slightly different weight distribution and aerodynamics may produce marginal variations.
Off-Road and Towing:
While not the primary focus, the V8 Gladiator will maintain a strong towing capacity. The added power should support towing ratings comparable to or exceeding the current maximum. Pricing is expected to start at $80,000+, positioning the Rubicon 392 as a premium off-road and performance variant.
Engine Comparison and Selection Guide
| Engine | Horsepower | Torque (lb-ft) | Fuel Type | EPA Combined MPG | Max Towing | Status |
|---|---|---|---|---|---|---|
| 3.6L Pentastar V6 | 285 | 260 | Gasoline | 19 | 7,700 | Current Standard |
| 3.0L EcoDiesel V6 | 260 | 442 | Diesel | 24 | 6,500 | Discontinued 2023 |
| 6.4L Hemi V8 | 470 | 470 | Gasoline | TBD | TBD | 2026 Rubicon 392 |
For Daily Drivers:
The standard 3.6L V6 suits most buyers seeking a balance of power, efficiency, and practicality. Its fuel economy remains respectable for a truck, and the 285 hp proves adequate for both highway cruising and moderate towing. Maintenance costs are predictable, parts availability is excellent, and resale value holds strong.
For Fuel Economy Enthusiasts:
Buyers prioritizing efficiency should consider used 2021–2023 EcoDiesel models. The diesel’s 442 pound-feet of torque delivers noticeable off-road advantages, and the 24 mpg combined rating justifies the premium diesel fuel cost for high-mileage owners. Expect $40,000–$55,000 for used models in good condition.
For Performance Seekers:
The incoming 6.4L Hemi V8 targets buyers who view the Gladiator as a performance platform rather than a practical workhorse. The 470 hp and 470 lb-ft torque deliver supercar-level straight-line speed in a truck form factor. Plan for premium fuel pricing and notably lower fuel economy, with real-world expectations around 15–18 mpg.
Transmission Options
All current Gladiators use an 8-speed automatic transmission (TorqueFlite 850RE). This transmission delivers smooth, responsive gear changes across terrain and highway driving. Manual transmissions—a 6-speed option offered through 2024—have been discontinued, making the automatic the only choice for 2025 and beyond.
The automatic transmission includes manual shift capability via steering wheel paddles or console buttons, allowing drivers to hold gears during off-road descents or spirited driving.
Fuel Economy and Real-World Performance
EPA Ratings (3.6L V6):
- City: 17 mpg
- Highway: 22 mpg
- Combined: 19 mpg
Real-World Testing: Car and Driver’s 75-mph highway test returned 21 mpg on an Overland model. Mojave variants equipped with larger tires and a 4.10 axle ratio dropped to 15 mpg due to increased rolling resistance and gear ratio changes. Off-road usage and aggressive driving reduce efficiency further.
Fuel Tank and Range:
The 22-gallon fuel tank provides approximately 374 miles of city range and 484 miles of highway range. At 22 mpg highway, owners can expect roughly 460 miles per tank under ideal conditions.
What Factors Into Engine Selection?
Usage Pattern:
Off-road enthusiasts benefit from the V6’s broad torque band and proven reliability in harsh conditions. Commuters and highway travelers gain slightly from diesel efficiency but face maintenance complexity. Performance enthusiasts should anticipate the V8.
Budget Considerations:
The 3.6L V6 carries no premium over base pricing. The discontinued EcoDiesel commanded a \$6,000 premium. The forthcoming 6.4L V8 Rubicon 392 will likely cost $15,000–$20,000 more than the standard V6.
Warranty and Service:
All factory gasoline engines carry a 3-year/36,000-mile basic warranty, with 5-year/60,000-mile powertrain coverage. Diesel engines, when available, required specialized service at Jeep dealers, increasing ownership costs for repairs and maintenance.
The Bottom Line
The Jeep Gladiator’s standard 3.6-liter Pentastar V6 remains a capable, proven powertrain that balances performance, efficiency, and reliability. For those seeking maximum torque, used EcoDiesel models offer legitimate advantages despite their discontinued status. The 2026 6.4-liter Hemi V8 Rubicon 392 transforms the Gladiator into a high-performance variant for buyers willing to prioritize power over economy.
Choose the V6 for practical versatility, pursue the EcoDiesel in the used market for efficiency, or anticipate the V8 for unapologetic performance. Each option serves distinct buyer priorities within the midsize truck landscape.