Ram 3500 Dually Towing Capacity: Complete 2024–2026 Specs & Engine Guide

The Ram 3500 dually towing capacity reaches a maximum of 37,090 lbs (2024) and 36,610 lbs (2025–2026) when configured with the 6.7L Cummins High-Output diesel, 3.42 axle ratio, Regular Cab 8-foot box, and a frame-mounted gooseneck hitch. That headline figure covers only one specific build — the actual number on your truck depends on cab style, drivetrain, engine, axle ratio, and hitch type.

This guide breaks down every configuration for the 2024–2026 Ram 3500 DRW with exact SAE J2807-certified specs, the 2025 transmission revolution from Aisin to ZF TorqueFlite HD, and a direct competitor comparison against the Ford F-350 and GMC Sierra 3500 HD.

Ram 3500 Dually Towing Capacity by Engine (2024–2026)

Ram offers two powertrain families for the 3500: the naturally aspirated 6.4L HEMI V8 gasoline engine and the 6.7L Cummins turbodiesel in Standard Output (SO) and High-Output (HO) variants. Engine choice is the single biggest determinant of your tow rating.

Note the inverse relationship between towing and payload: the lighter HEMI V8 block delivers the highest payload (7,590 lbs) while the heavier Cummins HO block — despite dominating towing — consumes more of the fixed 14,000-lb GVWR, leaving less payload budget. For a direct look at how the 6.7L performs in the Ram 2500 HD context, see our 6.7L Cummins fuel economy guide.

Ram 3500 dually towing capacity dashboard 2024–2026: engine comparison, competitor ranking, hitch type limits, and DRW vs SRW comparison

6.7L Cummins High-Output: Engineering Breakdown

The HO Cummins is rebuilt at the foundation to handle 1,075 lb-ft of torque. Key metallurgical upgrades include a Compacted Graphite Iron (CGI) block — stronger and lighter than traditional cast iron — forged connecting rods, low-friction piston rings, and a 2,000-bar high-pressure fuel rail for optimal diesel atomization. The Variable Geometry Turbocharger (VGT) eliminates lag at low RPM while providing full boost at the top end. For 2025, Cummins also reduced cold-weather wait-to-start times as part of the ongoing 35-year partnership with Ram.

6.4L HEMI V8: The Payload Champion

The 6.4L HEMI V8 uses Variable Cam Timing (VCT) and Interactive Deceleration Fuel Shut Off (iDFSO) for broad power delivery and improved highway efficiency. While its 18,150-lb tow ceiling is far below the Cummins HO, the gas engine is the go-to choice for contractors hauling heavy bed loads — heavy equipment, dump bodies, slide-in campers — where the 7,590-lb payload rating is the primary metric. For HD towing comparison with the Ram 2500, see our Ram 2500 gas vs diesel guide.

The 2025 Transmission Revolution: ZF TorqueFlite HD 8-Speed

The most significant mechanical change across the 2024–2026 generation is the complete replacement of the Aisin AS69RC 6-speed (and 68RFE 6-speed) transmissions with the ZF TorqueFlite HD 8-speed automatic starting in the 2025 model year.

The ZF’s 4.71 first gear enables explosive off-the-line pulling — critical when moving a 36,000-lb gooseneck from a dead stop on a grade. The smart-launch protocol (automatically skipping 1st when unloaded) prevents the lurching feel that would otherwise make daily driving uncomfortable. The tighter 8-gear spacing keeps the Cummins closer to its peak 1,075 lb-ft torque band throughout gear changes, eliminating the momentum drops that plagued the wider 6-speed ratios on steep grades.

Axle Ratios and Their Impact on Ram 3500 DRW Towing

The axle ratio is the final mechanical multiplier between the engine and the ground. Choosing the wrong ratio at the dealership can cost thousands of pounds of legal towing capacity. For a full breakdown of Ram axle codes and what they mean across all models, see our Dodge Ram gear ratio chart.

The 2025 shift from 4.10 to 3.42 for the Cummins HO DRW is counterintuitive but logical: the ZF 8-speed’s aggressive 4.71 first gear provides more than enough mechanical advantage at launch, making a numerically lower axle ratio viable — and it allows the engine to cruise at dramatically lower RPMs in the 0.67 overdrive, improving highway fuel economy under load.

Ram 3500 DRW Towing Capacity by Cab Configuration

Cab size and bed length add curb weight, which directly reduces the remaining headroom within the fixed 45,000-lb GCWR. The headline 36,610-lb rating requires the lightest possible cab — Regular Cab — and is not achievable in a Crew Cab or Mega Cab build.

6.7L Cummins HO DRW — 3.42 Axle Ratio (2025–2026)

6.4L HEMI V8 DRW — 4.10 Axle Ratio (2025–2026)

DRW vs SRW: Why the Dually Matters for Maximum Tow Ratings

The fundamental structural difference between Single Rear Wheel (SRW) and Dual Rear Wheel (DRW) Ram 3500 configurations is not engine power — it is rear axle load rating (GAWR) and tire load capacity.

A 20,000-lb fifth-wheel camper generates approximately 4,000–4,500 lbs of downward pin weight (20–22% of trailer weight). An SRW Ram 3500’s two rear tires cannot safely absorb that concentrated vertical load at highway speeds — the DRW’s four rear tires distribute the force across double the contact patch, keeping the truck within its GVWR and preventing rear suspension overload and tire failure. For the older-generation Ram 3500 comparison point, see our 2021 Ram 3500 towing capacity chart and the 2018 Ram 3500 towing capacity chart.

Hitch Types and Maximum Capacity Limits

The Ram 3500’s towing potential is gated by the hitch hardware — not just the drivetrain. Three distinct connection types apply, each with a hard structural ceiling.

To legally and safely surpass 23,000 lbs, operators must use an in-bed hitch. Ram’s factory Fifth-Wheel/Gooseneck Tow Prep Group includes structural mounting pucks engineered into the frame and a second 7-pin harness inside the bed. Installing a brake controller for any trailer over 10,000 lbs is mandatory in most states. See our Dodge Ram brake controller wiring diagram for pin-out and installation steps.

SAE J2807 Compliance: How Tow Ratings Are Certified

All published Ram 3500 towing figures are SAE J2807-certified — not marketing estimates. To achieve certification, each configuration must tow its rated maximum up the Davis Dam grade (7% sustained grade in extreme ambient heat) without engine or transmission overheating, loss of air conditioning performance, or structural failure. The J2807 baseline subtracts fixed weight allowances from the GCWR before calculating the trailer limit:

Only after all these deductions are subtracted from the GCWR does the final trailer weight figure appear in Ram’s published towing charts. This is why real-world towing always starts below the published maximum — actual operator weight, gear, and fuel are already consuming the GCWR before the trailer is hooked up.

Ram 3500 vs Ford F-350 vs GMC Sierra 3500 HD: Competitor Comparison

The one-ton dually segment is a three-way contest where manufacturers trade “Best-in-Class” towing within a few thousand pounds of each other every model year.

Ford holds the absolute peak towing number due to the higher-torque Power Stroke and aluminum body savings. Ram counters with a proven inline-six Cummins architecture — inherently smoother power delivery and a superior exhaust braking characteristic — plus the most refined interior execution in the segment. The ZF 8-speed has largely closed Ram’s historical transmission quality gap with GM’s Allison-branded unit. For the Ram 2500 HD competitive context, see our 2024 Ram 2500 towing capacity guide.

Advanced Towing Technology (2025–2026 Ram 3500)

Raw towing numbers matter, but the 2025–2026 Ram 3500 incorporates a full suite of active safety and convenience technologies that make moving 36,000-lb loads safer and less fatiguing.

Auto-Level Rear Air Suspension

Replaces traditional leaf springs with adjustable pneumatic air bags. Bed Lowering Mode drops the rear to minimum height for easy fifth-wheel or gooseneck hookup. Once hitched, the system automatically levels the truck when pin weight is applied, maintaining correct headlight aim and steering geometry under full load. This is a class-exclusive feature unavailable on Ford F-350 or GMC Sierra 3500 HD at this level of integration.

Trailer Reverse Steering Control

The driver turns a dashboard dial to set the desired trailer direction; the system calculates trajectory and manipulates electric power steering automatically. It removes the counterintuitive reverse-steering challenge for 40-foot articulated trailers in tight quarters.

Digital Rearview Mirror 3.0 (DRVM 3.0)

When a tall fifth-wheel or enclosed cargo trailer blocks the physical mirror view, the DRVM 3.0 displays a high-definition rear camera feed directly in the mirror glass. Side camera feeds monitor trailer flanks during tight turns — critical when the trailer extends 40+ feet behind the truck.

On-Board Power (2.4kW Inverter)

Dual 110-volt outlets in the bed let contractors run power tools, air compressors, or job-site equipment directly from the truck’s electrical architecture — eliminating the need for a generator on short-duration jobs.

Payload and GCWR Math: What Actually Limits You

Maximum towing capacity is the ceiling — not the everyday number. Real-world capacity depends on how much GCWR headroom remains after accounting for your specific loaded truck weight.

Example: Crew Cab 4×4 HO Cummins DRW (2025)

This is why the published 33,890-lb maximum for the Crew Cab 4×4 HO config is achievable only in a bare truck — real-world loads typically leave 1,000–2,000 lbs of additional buffer consumed before the trailer is hooked. Staying below published maximums by 10–15% is the standard commercial practice for heavy operators. For Cummins engine maintenance intervals that preserve towing reliability long-term, see our 6.7L Cummins DPF pressure sensor guide and our 6.7L Cummins oil type guide.

Frequently Asked Questions

What is the maximum towing capacity of a 2024 Ram 3500 dually?

The maximum towing capacity of a 2024 Ram 3500 dually is 37,090 lbs. This requires: Regular Cab, 8-foot box, 4×4 drivetrain, 6.7L Cummins High-Output diesel, 4.10 axle ratio, and a frame-mounted gooseneck hitch. For the 2025 and 2026 model years, the maximum drops slightly to 36,610 lbs due to engineering revisions accompanying the new ZF TorqueFlite HD 8-speed transmission.

Why did Ram replace the Aisin transmission with the ZF in 2025?

Stellantis replaced the Aisin AS69RC 6-speed with the ZF TorqueFlite HD 8-speed for 2025 for three primary reasons: tighter gear spacing keeps the Cummins in its peak torque band throughout long grades; the 4.71 first gear enables more explosive off-the-line pulling; and the 8-speed is approximately 30 lbs lighter, improving payload. The Aisin units also faced historical reliability scrutiny regarding K1 clutch drum snap ring failures in earlier model years, which prompted NHTSA investigations.

Do I need a dually to tow a 20,000-lb fifth-wheel camper?

Yes — for safety and structural compliance. A 20,000-lb fifth-wheel generates approximately 4,000–4,500 lbs of downward pin weight. An SRW Ram 3500’s rear GAWR of ~6,350 lbs may technically accommodate this on paper, but the concentrated vertical load on only two rear tires creates severe handling instability, rear suspension overload, and high-speed blowout risk. The DRW’s 9,750-lb rear GAWR across four tires is specifically designed for this application.

What is the GCWR of the 2025–2026 Ram 3500 DRW?

The maximum GCWR for a 2025–2026 Ram 3500 DRW with the 6.7L Cummins HO and 3.42 axle ratio is 45,000 lbs. This is the combined ceiling for the fully loaded truck plus the fully loaded trailer — not just the trailer weight alone. Every pound the truck weighs (including driver, passengers, fuel, and cargo) reduces the allowable trailer weight proportionally.

Can the Ram 3500 gas engine tow reliably for commercial use?

Yes — the 6.4L HEMI V8 DRW with the 4.10 axle ratio is a reliable commercial engine rated at 18,150 lbs maximum towing. It will downshift more frequently and rev higher than the diesel on steep grades, but it is approximately 800–1,000 lbs lighter, which unlocks the 7,590-lb maximum payload rating. It is the optimal choice for local contractors hauling heavy bed loads rather than long-haul heavy-trailer transport.

How does the Ram 3500 compare to the 2021 Ram 3500 in towing?

The 2024–2026 Ram 3500 DRW’s 37,090-lb maximum (2024) represents a meaningful increase from the 2021-era maximum. The 2021 Ram 3500 DRW with the HO Cummins was rated at 35,100 lbs — see our 2021 Ram 3500 towing capacity chart for the full generation comparison. The core powertrain gains from the 2021 to 2024 model year come from incremental Cummins calibration improvements and frame reinforcement that pushed the GCWR ceiling higher.