2025 Ram Heavy Duty Engine and Transmission Update
2025 Ram 2500-3500 in Slidell, LA
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2025 Ram Heavy Duty Engine & Transmission Updates
The 2025 Ram Heavy Duty gets major enhancements in it’s engine and transmission, reinforcing its reputation as one of the most powerful, most durable, and most advanced in the heavy-duty pickup trucks out there. Updates within its power units further push performance, efficiency, and set new towing capabilities, making the lineup even more appealing both for commercial and recreational usage.
Engine Updates
The 2025 Ram Heavy Duty trucks retain a formidable lineup of robust engines, the refinements centered around further improving output, efficiency, and reliability. For the gas lovers, an updated 6.4-liter HEMI® V8 awaits, its revised cylinder head and intake manifold design aimed at further improving airflow and combustion. Horsepower is down slightly as compared to last year at 405 but peak touque is still 429 pound feet. Additionally, the engine now comes fitted with a more efficient variable cam timing system for wider-range peak performance.
The well-renowned 6.7-liter Cummins® Turbo Diesel engine remains in place but now features a recalibrated turbocharger and updated fuel injection system for 2025. The result is improved responsiveness, reduced turbo lag, and better fuel economy. This means the high-output version of the Cummins engine now doles out a full 1,075 lb-ft of torque, mated to 430 horsepower, to easily make this one of the most powerful options in the heavy-duty segment. The High Output 6.7L is now available on 2500 starting with the Laramie trim.The improved cooling system, featuring a larger intercooler and updated radiator, sees the engine pulling extreme towing and hauling loads without affecting reliability.
For the greener buyers, Ram has also introduced a series of advanced emissions-reduction technologies that will help to meet stringent 2025 EPA standards. The new Cummins includes a newly designed selective catalytic reduction (SCR) system and improved diesel particulate filter (DPF), which cut NOx and particulate emissions without sacrificing performance.
Transmission Enhancements
Complementing the powertrain updates is a significant upgrade to the transmission systems. The proven TorqueFlite® 8-speed automatic in the 6.4-liter HEMI V-8 features new optimized shift points which promote efficiency during rigorous hauling. Additional refinement was afforded via gearing and an upgraded adaptive learning strategy helps to adapt shift patterns for improved responsiveness to driving conditions and loads.
In the diesel-powered models, Ram Heavy Duty trucks retain the battle-tested Aisin AS69RC 6-speed automatic transmission but feature improved internal components for 2025, including hardened gear sets and superior hydraulic systems. These changes allow the transmission to be fully capable of handling the high-output Cummins Turbo Diesel engine's increased torque output, especially in extreme towing applications. Furthermore, a new thermal management system has also been added to keep operating temperatures within a robust range during heavy loads.
It also features a reprogrammed transmission software for improved responsiveness and fuel economy. Downshifts will occur more promptly on acceleration, while gear changes pull more smoothly under heavy trailer tow conditions. Additionally, Ram updated the Tow/Haul mode with enhanced adjustment for shift points and engine braking to afford drivers more control on extreme grades.
Conclusion
The 2025 Ram Heavy Duty lineup cements its leading position in the heavy-duty truck market with an updated engine and transmission. With even more power, durability, and efficiency, these trucks will be better positioned to handle anything from extreme towing capability to the everyday dependability modern drivers have grown to need and expect. It proves again that Ram means innovation, as its heavy-duty trucks continue at the forefront of the performance envelope and advanced technology.
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Max payload/towing estimate ratings shown. Additional options, equipment, passengers, and cargo weight may affect payload/towing weights. See dealer for details.