2021 Ram 1500 Big Horn 5.7 Hemi Specs 2026 Quick Reference
Quick Answer
The 2021 Ram 1500 Big Horn with the 5.7L HEMI V8 produces 395 horsepower and 410 lb-ft of torque, with towing capacities ranging from approximately 8,000 to 11,500 lbs depending on configuration. Precise specifications vary significantly based on cab size, bed length, axle ratio, and the presence of the eTorque mild-hybrid system. Always refer to your vehicle’s specific Payload Sticker and Owner’s Manual for exact ratings.
Searching for the exact 2021 Ram 1500 Big Horn 5.7 Hemi specs? Don’t rely on broad marketing claims found in glossy brochures. Generic online data often ignores the specific axle ratios, eTorque options, and cab configurations that dictate your truck’s actual capability. This guide provides an authoritative, verified breakdown of 2021 Ram 1500 specifications to help you safely manage towing, maintenance, and vehicle performance.
2021 Ram 1500 Big Horn 5.7 Hemi Specs: The Ultimate Data Reference
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This reference covers the 2021 model year Ram 1500 (DT platform) equipped with the 5.7L HEMI V8 engine. Specifications such as payload and towing capacity are subject to variation based on drivetrain (4×2 vs 4×4), axle ratio (3.21, 3.92), and cab/bed configuration. Last reviewed: August 2026. Always verify against your specific vehicle’s door jamb sticker.
General Specification Table for 2021 Models
| Specification | Value | Notes |
|---|---|---|
| Engine Type | 5.7L HEMI V8 | Naturally Aspirated OHV |
| Horsepower | 395 hp @ 5,600 rpm | Standard across all 5.7L |
| Torque | 410 lb-ft @ 3,950 rpm | Maintained peak delivery |
| Transmission | 8HP75 8-Speed Auto | TorqueFlite system |
| Max Towing | Up to 12,750 lbs | Requires specific axle/trim |
Understanding 2021 Ram 1500 5.7L Hemi Performance and Capabilities
The 5.7L HEMI remains the industry benchmark for light-duty truck performance. Built on the DT platform, the engine utilizes a classic overhead valve (OHV) pushrod architecture that favors low-to-mid-range torque, which is essential for heavy lifting and towing tasks.
Pushrod Architecture and Hemispherical Combustion
The “HEMI” name derives from the hemispherical combustion chambers that allow for larger valves and efficient flame propagation. This design ensures the 5.7L remains highly responsive under load, providing consistent power delivery regardless of the driving environment.
The Role of eTorque in the 2021 Big Horn
In 2021, buyers could opt for the eTorque mild-hybrid system. Unlike a traditional hybrid, eTorque does not power the vehicle on electricity alone. Instead, it uses a 48-volt motor-generator to provide “torque fill” during acceleration, smoother engine stop-start transitions, and improved energy recapture during braking.
395 HP
410 LB-FT
Towing and Payload Limits for the 2021 Ram 1500 Big Horn
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Towing capacity is not a static number based solely on the engine. For your 2021 Big Horn, the limit is governed by the GCWR (Gross Combined Weight Rating) and the specific build configuration.
Why Axle Ratios Determine Towing Performance
The 3.92 axle ratio offers significantly more aggressive acceleration and towing grunt compared to the 3.21 ratio, which is typically geared for better fuel economy during highway cruising. If your goal is towing near the maximum rating, the 3.92 gear set is the preferred component.
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How to Verify Your Capacity
Open the driver-side door and look for the yellow and white “Tire and Loading Information” placard.
Note the Gross Vehicle Weight Rating (GVWR) on the placard to understand the maximum weight your specific truck can support, including passengers and cargo.
Key Differences in 2021 Ram 1500 Suspension and Drivetrain
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Ram distinguishes itself in the 2021 market by utilizing a multi-link rear suspension with coil springs, whereas competitors like the Ford F-150 and Chevrolet Silverado 1500 historically maintained traditional leaf spring setups for their core models.
Multi-link Coil Spring vs. Traditional Leaf Springs
The coil spring system provides superior ride quality and axle articulation. By reducing “axle hop” under hard acceleration and improving bump absorption, the DT platform provides a more passenger-car-like feel even when the truck is unloaded. The TorqueFlite 8-speed automatic transmission further optimizes this performance, offering crisp shifts that keep the 5.7L Hemi in its power band during demanding maneuvers.
Modifying suspension components or tires can significantly alter your truck’s towing and payload capacity. If you have added aftermarket equipment, you must recalculate your available payload to ensure you remain within the manufacturer’s safe operating limits.
2021 Ram 1500 Big Horn 5.7 Hemi Specs Questions Answered
Is the 5.7L Hemi reliable? Yes, it is a proven OHV engine platform known for high-mileage longevity when standard maintenance, such as regular full-synthetic oil changes, is performed.
How do I know if I have eTorque? Check the engine cover; eTorque-equipped models usually have specific branding. Additionally, your window sticker (Monroney label) or a VIN lookup at a Ram dealership will confirm the presence of the 48-volt system.
What fuel does the 2021 5.7 Hemi require? It is designed to run on 89 octane (Mid-grade) for optimal performance, though 87 octane is generally acceptable for standard operation. Refer to your owner’s manual for specific requirements.
In summary, the 2021 Ram 1500 Big Horn is a sophisticated DT platform vehicle that blends heavy-duty performance with a refined suspension. The eTorque system is an optional addition, not a standard feature on all 5.7L engines. Always verify your specific truck’s towing limits using the VIN-specific door placard. If you are uncertain about your truck’s configuration, contact a local Ram service department with your VIN to retrieve the factory-built specifications.
