2015 Ram 1500 Big Horn Towing Capacity 2026 Updated
Quick Answer
The 2015 Ram 1500 Big Horn has a maximum towing capacity ranging from 4,190 lbs to 10,650 lbs. Achieving the maximum 10,650-lb rating requires the 5.7L HEMI V8, Quad Cab 2WD configuration, and the 3.92 rear axle ratio. Models equipped with 3.21 axle ratios or the 3.6L Pentastar V6 tow significantly less. Always verify payload on your driver-side door sticker.
The 2015 Ram 1500 Big Horn towing capacity spans between 4,300 and 10,650 pounds across its factory configurations. However, your specific truck’s safe pulling limit is not a fixed universal figure. Real-world capability hinges strictly on its powertrain, cab style, bed length, and—most importantly—the rear axle differential ratio installed on the assembly line. While a rear-wheel-drive Quad Cab equipped with the 5.7L HEMI V8 and 3.92 rear gears achieves the brochure maximum of 10,650 pounds, opting for a 3.21 highway gear set or the standard 3.6L Pentastar V6 drastically reduces pulling limits. Navigating these exact factory specifications ensures you hitch up safely without exceeding gross weight ratings.
2015 Ram 1500 Big Horn Towing Capacity Chart by Engine
Recommended Best Deal Products
📤 Share Image
For the 2015 model year, Ram officially aligned its published tow ratings with the standardized SAE J2807 towing methodology. This third-party standard enforces rigorous testing requirements covering minimum acceleration, 12% grade launch capability, dynamic sway control, and total thermal cooling under maximum Gross Combined Weight Rating (GCWR). Consequently, the ratings published for the 2015 Big Horn reflect genuine structural and thermal benchmarks rather than unchecked marketing numbers.
Data Scope and Tow Rating Accuracy Guidelines
The specifications in this guide represent factory-stock 2015 Ram 1500 Big Horn and Lone Star edition configurations equipped with the standard TorqueFlite 8-speed automatic transmission. Because actual capacity fluctuates significantly based on passenger load, hitch hardware, and bed accessories, always cross-reference these ratings with your truck’s physical door jamb labels.
Covers 2015 Ram 1500 Big Horn / Lone Star trim levels across 3.6L Pentastar V6, 3.0L EcoDiesel V6, and 5.7L HEMI V8 engine options. Ratings are sourced directly from the factory Ram Body Builder and Towing Specifications guide complying with SAE J2807. Last reviewed: October 2026. Always confirm your truck’s specific Gross Vehicle Weight Rating (GVWR) on the driver’s side B-pillar door sticker.
4,300 lbs
3.6L V6 Crew Cab 4×4 (3.21 Axle)
8,150–8,600 lbs
5.7L HEMI Crew Cab (3.21 Axle)
10,650 lbs
5.7L HEMI Quad Cab 4×2 (3.92 Axle)
Official 2015 Big Horn Towing Capacity Specifications Table
The table below outlines the maximum factory-rated towing capacity for the 2015 Ram 1500 Big Horn across primary cab styles, drivetrains, and axle ratios. To read this chart properly: locate your engine, cross-reference your driveline (4×2 or 4×4) and cab size, and match your differential ratio.
| Year | Engine | Drivetrain / Cab | Max Towing Capacity | Notes |
|---|---|---|---|---|
| 2015 | 3.6L Pentastar V6 (305 hp / 269 lb-ft) | 4×2 Quad Cab (6’4″ Bed) | 4,800 lbs | Standard 3.21 axle ratio; 8-speed automatic |
| 2015 | 3.6L Pentastar V6 (305 hp / 269 lb-ft) | 4×4 Quad Cab (6’4″ Bed) | 4,550 lbs | Standard 3.21 axle ratio; base towing hardware |
| 2015 | 3.6L Pentastar V6 (305 hp / 269 lb-ft) | 4×4 Crew Cab (5’7″ Bed) | 4,300 lbs | Light-duty baseline; ideal for small utilities/skiffs |
| 2015 | 3.0L EcoDiesel V6 (240 hp / 420 lb-ft) | 4×2 Quad Cab (6’4″ Bed) | 8,300 lbs | Requires 3.55 rear axle ratio option |
| 2015 | 3.0L EcoDiesel V6 (240 hp / 420 lb-ft) | 4×4 Crew Cab (5’7″ Bed) | 7,950 lbs | With 3.55 gears; with 3.21 gears rating drops to ~6,950 lbs |
| 2015 | 5.7L HEMI V8 (395 hp / 410 lb-ft) | 4×2 Quad Cab (6’4″ Bed) | 8,650 lbs | Standard 3.21 rear differential gearing |
| 2015 | 5.7L HEMI V8 (395 hp / 410 lb-ft) | 4×2 Quad Cab (6’4″ Bed) | 10,650 lbs | Equipped with optional 3.92 gears & Class IV hitch |
| 2015 | 5.7L HEMI V8 (395 hp / 410 lb-ft) | 4×4 Crew Cab (5’7″ Bed) | 8,150 lbs | Standard 3.21 gearing (most common dealer build) |
| 2015 | 5.7L HEMI V8 (395 hp / 410 lb-ft) | 4×4 Crew Cab (5’7″ Bed) | 10,150 lbs | Equipped with 3.92 gears; requires WDH over 5,000 lbs |
| 2015 | 5.7L HEMI V8 (395 hp / 410 lb-ft) | 4×4 Crew Cab (6’4″ Bed) | 10,050 lbs | Equipped with 3.92 gears; long wheelbase chassis |
Footnote: Ratings assume a base curb weight vehicle including standard 150 lb driver and 150 lb passenger allowances under SAE J2807. Any dealer-added accessories, aftermarket suspension lifts, or oversized off-road tires directly reduce your effective tow rating.
Engine Capability Overview and Tow Rating Breakdown
The 2015 Ram 1500 Big Horn offered three distinct powerplants, each tuned for a specific performance profile. Below is a visual comparison of the absolute maximum towing capacity achievable by each engine platform when fully optioned with performance differential gears.
Displays the absolute ceiling for each engine when optioned with the lowest (most aggressive) available rear differential ratio.
10,650 lbs
8,300 lbs
4,800 lbs
The TorqueFlite 8-speed automatic transmission is standard across all three engines. Its steep 4.71:1 first gear provides impressive off-the-line mechanical advantage, allowing Ram engineers to specify taller rear axle ratios for improved fuel efficiency without completely crippling initial takeoff under load. However, as load demands rise, rear differential gearing quickly becomes the limiting mechanical factor.
How Axle Ratios Determine 2015 Ram 1500 Big Horn Towing Capacity
The rear differential ratio is the single most critical variable dictating whether a 2015 Ram 1500 Big Horn can tow a mid-size camper or a heavy equipment trailer. Even when two trucks share identical body lines, paint, HEMI V8 engines, and interior packages, differential gearing can split their rated capacities by over 2,000 pounds.
3.21 vs 3.92 Differential Gears: The 2,000-Pound Difference
To meet stringent Corporate Average Fuel Economy (CAFE) targets, Ram equipped standard 2015 Big Horn HEMI models with a 3.21:1 rear axle ratio. This tall gearing lowers engine RPM on the interstate, returning better highway gas mileage when unloaded. However, it severely limits mechanical leverage at low-to-mid speeds.
For example, consider two identical 2015 Crew Cab 4×4 HEMI Big Horn models with a 5’7″ bed:
- Standard 3.21 Axle: Rated to tow 8,150 lbs with a Gross Combined Weight Rating (GCWR) of 13,800 lbs.
- Optional 3.92 Axle: Rated to tow 10,150 lbs with a GCWR of 15,950 lbs.
That is an exact 2,000-pound deficit simply due to internal differential ring-and-pinion tooth counts. Assuming that any HEMI Big Horn can tow 10,000+ pounds without verifying this ratio is one of the most dangerous and common mistakes half-ton owners make.
The 2015 Ram factory window sticker lists standard equipment on the left and optional equipment on the right. If the 3.92 rear axle is not explicitly printed in the right-hand options column, your 5.7L HEMI Big Horn arrived from Warren Truck or Saltillo Assembly with the base 3.21 axle ratio.
3.55 Gears on EcoDiesel Models: Balancing Torque and Economy
The 3.0L EcoDiesel V6 produces 420 lb-ft of torque at just 2,000 RPM. While it pulls with impressive low-end authority, it was restricted to either a 3.21:1 or 3.55:1 axle ratio from the factory. EcoDiesel models were not paired with 3.92 gears. Equipping an EcoDiesel Crew Cab 4×4 with 3.55 gears sets the towing capacity at 7,950 pounds, whereas the 3.21 gear drops the rating to roughly 6,950 pounds. For diesel owners looking to tow mid-weight boats or aerodynamic enclosed trailers, the 3.55 rear end is vital.
How to Verify Your Ram’s Factory Axle Ratio from the Build Sheet
Because used trucks frequently exchange hands without original window stickers, relying on assumptions is risky. Here is how you can verify your exact gearing configuration today:
Navigate to the official Ram Trucks owner support portal, enter your 17-digit Vehicle Identification Number (VIN), and generate your factory “Equipment Listing” PDF. Look under the mechanical summary for either “3.21 Rear Axle Ratio”, “3.55 Rear Axle Ratio”, or “3.92 Rear Axle Ratio”.
Crawl underneath the rear of the truck with a flashlight. Locate the white adhesive barcode tag affixed to the passenger-side rear axle tube or the differential cover. It will display the ratio code directly (e.g., “3.21” or “3.92”) alongside the ring gear diameter (typically 9.25 inches for 1500 models).
Payload Capacity, GVWR, and GCWR: Real-World Towing Limits
Recommended Best Deal Products
Towing capacity is only half of the safety equation. In nearly every real-world towing scenario involving travel trailers, campers, or livestock haulers, your 2015 Ram 1500 Big Horn will exceed its Gross Vehicle Weight Rating (GVWR) or payload limit hundreds of pounds before approaching its advertised trailer pulling limit.
Calculating Tongue Weight Against the Tire and Loading Door Sticker
Every conventional bumper-pull trailer requires adequate weight pressing down on the hitch ball to prevent catastrophic trailer sway at highway speeds. According to SAE standards, recommended trailer tongue weight ranges between 10% and 15% of the fully loaded trailer weight (12% to 13% is standard for stable RV towing).
The yellow “Tire and Loading Information” sticker located inside your driver’s door jamb states: “The combined weight of occupants and cargo should never exceed XXX kg or XXX lbs.” On well-optioned 2015 Big Horn Crew Cabs, available payload typically sits between 1,300 and 1,500 pounds. Trailer tongue weight presses directly down on the rear axle and consumes this payload dollar-for-dollar.
Gross Vehicle Weight Rating (GVWR) vs Gross Combined Weight (GCWR)
Understanding the boundary conditions keeps your rig safe and legal:
- GVWR (Gross Vehicle Weight Rating): The maximum permissible operating weight of your truck alone, encompassing curb weight, all passengers, cabin cargo, fuel, aftermarket bed caps, and trailer tongue weight (typically 6,800 to 6,945 lbs on 2015 Big Horn 1500s).
- GCWR (Gross Combined Weight Rating): The maximum allowable total weight of the truck, trailer, occupants, and all cargo combined (ranging from 9,800 lbs on V6s up to 15,950 lbs on 3.92-geared HEMIs).
- GAWR (Gross Axle Weight Rating): The maximum weight rating specifically allocated to the front and rear axles individually. Overloading tongue weight will often breach the Rear GAWR (typically ~3,900 lbs) even when GCWR looks compliant.
Why Payload Runs Out Before Maximum Pull Rating on Big Horn Models
To see how payload creates an immediate ceiling, review this practical calculation for an 8,000-pound loaded travel trailer hitched to a 2015 Ram 1500 Big Horn Crew Cab 4×4 HEMI with an available payload rating of 1,450 pounds:
An 8,000 lb trailer creates 1,040 lbs of direct downward tongue weight on the receiver ball.
A heavy-duty weight-distribution hitch head and spring bars add approximately 80–100 lbs to the receiver.
1,450 lbs total payload minus 1,130 lbs hitch weight leaves just 320 lbs for all cabin occupants and bed cargo.
If you load two adults, two teenagers, and a cooler into the cabin, this truck exceeds its GVWR by over 300 pounds—even though the 8,000-pound trailer is well below the truck’s theoretical 10,150-pound pull rating. Always calculate payload first before hitching up.
Essential Factory Towing Equipment for the 2015 Ram Big Horn
Reaching the upper tier of the 2015 Ram 1500 Big Horn towing chart requires specific mechanical hardware. Big Horn models—alongside their mechanically identical Texan twin, the Ram 1500 Lone Star edition—could be ordered with varying levels of towing equipment from the factory floor.
-
Class IV Frame-Mounted Receiver Hitch
The factory Class IV hitch is integrated directly into the rear bumper structure and frame horns. It features a standard 2-inch receiver tube. While stamped for heavy pulling, factory specifications state that any trailer exceeding 5,000 pounds must utilize a weight-distributing hitch to maintain front-axle contact and stay compliant with factory warranty guidelines.
-
Heavy-Duty Auxiliary Transmission Fluid Cooler
All 2015 Ram 1500 trucks equipped with the 8-speed automatic feature a thermal management unit that utilizes engine coolant to bring transmission oil up to operating temperature quickly, coupled with a secondary air-cooled auxiliary fluid heat exchanger up front. This prevents transmission fluid degradation during prolonged grade climbs under full load.
-
Integrated Trailer Brake Controller (ITBC)
Mounted on the lower dashboard switch bank to the right of the rotary gear selector, the factory ITBC integrates seamlessly into the truck’s anti-lock braking system (ABS) and Electronic Stability Control (ESC). It communicates directly with electric trailer brakes and electric-over-hydraulic systems, allowing driver gain adjustments via the central instrument cluster display.
-
Tow/Haul Mode Calibration
Activating the dashboard “Tow/Haul” button modifies the shift mapping of the 8-speed automatic transmission. It delays upshifts to hold the engine inside its optimal torque band, engages early torque converter lockup, and initiates automatic transmission downshifts during braking to supply engine braking assistance down steep mountain descents.
If your trailer’s gross weight exceeds 5,000 lbs, do not tow with a standard weight-carrying ball mount. A certified weight-distributing hitch (WDH) with integrated sway control distributes roughly one-third of the tongue weight back onto the truck’s front steering axle and trailer axles, restoring lost steering grip and headlight alignment.
2015 Ram 1500 Big Horn Towing Capacity vs Competitor Half-Tons
Recommended Best Deal Products
When evaluated against equivalent 2015 half-ton trim levels like the Ford F-150 XLT and Chevrolet Silverado 1500 LT, the Ram 1500 Big Horn delivers a unique balance of chassis comfort and pulling capacity. It also serves as a baseline to determine when you have outgrown the half-ton class entirely and require a 2500 heavy-duty platform.
Ram 1500 Big Horn vs Ford F-150 XLT and Chevy Silverado LT
The 2015 model year was marked by the launch of the military-grade aluminum-body Ford F-150, which shaved up to 700 pounds of curb weight to claim higher paper tow ratings. Meanwhile, General Motors relied on its traditional steel frame and EcoTec3 direct-injected V8s. Here is how the Big Horn compares against identically trimmed competitor Crew Cabs:
Coil Spring Ride Comfort vs Leaf Spring Towing Dynamics
The structural hallmark of the fourth-generation Ram 1500 is its multi-link rear coil-spring suspension. Traditional half-tons use semi-elliptic leaf springs, which handle excessive vertical squat well but produce a harsh, choppy ride when empty. Ram’s coil-spring architecture delivers exceptional unladen daily comfort and superior axle location on rough pavement.
The trade-off: coil springs exhibit more compliance (rear-end squat) under heavy hitch weight. For this reason, setting up a quality weight-distributing hitch with properly tensioned spring bars is even more crucial on a Ram 1500 than on leaf-sprung competitors to level out the stance and keep steering positive.
When to Upgrade to a 2015 Ram 2500 Big Horn Heavy-Duty Platform
While a 2015 Ram 1500 Big Horn handles 5,000 to 8,000-pound loads reliably, step up to a three-quarter-ton 2015 Ram 2500 Big Horn if your trailering needs cross specific thresholds:
- Trailers over 9,000 lbs Loaded: At this weight, tongue weights exceed 1,150 pounds, leaving virtually zero payload for your family or camping equipment in a 1500.
- Fifth-Wheel and Gooseneck Campers: Pin weights for 5th wheels typically sit between 18% and 25% of gross weight. This instantly overloads any half-ton truck’s rear axle rating.
- Frequent Mountain Towing: The Ram 2500 equipped with the 6.7L Cummins Turbo Diesel delivers 800 lb-ft of torque paired with a true factory exhaust brake, providing unmatched descending control that half-ton mechanical brakes cannot replicate.
Frequently Asked Questions About 2015 Ram 1500 Big Horn Towing Capacity
What is the towing capacity of a 2015 Ram 1500 Big Horn 5.7 HEMI?
A 2015 Ram 1500 Big Horn with the 5.7L HEMI V8 has a towing capacity ranging from 8,150 lbs to 10,650 lbs. Models with the standard 3.21 rear axle ratio top out between 8,150 and 8,650 lbs depending on cab style, while trucks equipped with the optional 3.92 performance axle ratio achieve ratings between 10,050 and 10,650 lbs.
Can a 2015 Ram 1500 Big Horn pull a travel trailer?
Yes, a 2015 Ram 1500 Big Horn HEMI or EcoDiesel easily pulls travel trailers weighing between 5,000 and 7,500 pounds dry weight (typically 6,000 to 8,500 pounds fully loaded). Always verify that the trailer’s 12–15% tongue weight plus passenger weight remains within the truck’s 1,200 to 1,800-pound door jamb payload rating, and use a weight-distributing hitch for loads exceeding 5,000 pounds.
How do I know if my 2015 Ram 1500 has the factory tow package?
A factory-equipped 2015 Ram 1500 tow package features a frame-mounted Class IV receiver hitch, 4-pin and 7-pin electrical trailer wiring plugs integrated next to the license plate, an Integrated Trailer Brake Controller on the lower dash, and extended trailer tow side mirrors (available on selected equipment packages). You can also run your VIN through the Mopar owner portal to download your original build sheet.
Is the Ram Lone Star towing capacity different from the Big Horn?
No. The Ram 1500 Lone Star edition is mechanically identical to the Big Horn. The Lone Star is a regional appearance package marketed exclusively in Texas, sharing identical frames, cooling components, rear suspensions, gear ratios, and SAE J2807 tow ratings with the Big Horn.
Final Guidelines for Safe Big Horn Towing
The 2015 Ram 1500 Big Horn towing capacity gives half-ton truck owners massive versatility, handling everything from light 4,300-pound utility runs to serious 10,650-pound hauling tasks. However, achieving those five-figure pulling maximums strictly requires the 5.7L HEMI V8, factory Class IV towing equipment, and the 3.92 rear differential ratio. Before hitching up a travel trailer or heavy cargo hauler, do not rely on rough marketing brochure estimates: check your driver-side door jamb Tire and Loading sticker, verify your rear axle ratio on the factory build sheet, and ensure your calculated tongue weight leaves enough payload for your family and gear.
![Best Dodge Ram 1500 Truck Bed Liners [2026]](https://truckguider.com/wp-content/uploads/2026/03/truck-bed-liner-dodge-ram-1500-featured.webp)
