Ram 2500 6.4 HEMI Horsepower by Year, 2024 to 2026

The Ram 2500 6.4 HEMI horsepower rating depends on which model year you’re looking at. For 2025 and 2026 models, Ram’s official specs list 405 horsepower and 429 lb-ft of torque. For 2014 through 2024 models, the same engine was rated at 410 horsepower with the same 429 lb-ft of torque.

That five horsepower gap trips up a lot of buyers and search results, since dealer sites and spec pages don’t always agree on which number is current. Below is the full year-by-year breakdown, an explanation of where the discrepancy comes from, and how the 6.4 HEMI stacks up against the 6.7 Cummins diesel option.

Ram 2500 6.4 HEMI Horsepower and Torque by Year

The 6.4L HEMI V8 joined the Ram 2500 and 3500 lineup for the 2014 model year as the standard gas engine, positioned below the 6.7 Cummins diesel. Torque has held steady at 429 lb-ft the entire time. Horsepower is where the number moves.

The cab and chassis version of the engine has always trailed the pickup rating. Ram governs it to a lower peak engine speed for commercial upfit applications, which caps output at 370 hp even though it shares the same block and torque figure as the pickup version.

For the full specs, towing numbers, and reliability picture on this engine, see our Ram 2500 6.4 HEMI specs guide.

Why Some Sources List 410 HP and Others List 405 HP

The discrepancy lines up with the 2025 Ram Heavy Duty refresh. Ram’s own 2025 model year materials, along with Edmunds’ and CarBuzz’s first-drive coverage of the refreshed truck, list the 6.4 HEMI at 405 horsepower. Older model year spec sheets and many dealer pages still quote 410 horsepower, which was the figure through the 2024 model year.

Ram has not published a technical bulletin explaining the five horsepower change. The engine’s displacement and basic architecture carried over unchanged into 2025, so this most likely reflects a running recalibration or an updated certification figure tied to the broader refresh, rather than a physical redesign.

If you’re shopping a 2014 to 2024 model, 410 hp is the accurate figure. For 2025 and 2026 models, use 405 hp.

6.4 HEMI vs 6.7 Cummins Horsepower and Torque Compared

The 6.4 HEMI’s real competition inside the Ram 2500 lineup is the 6.7 Cummins Turbo Diesel, not another automaker’s engine. The gap between the two has actually widened in recent years.

The 2025 refresh replaced the standard-output Cummins with a high-output version exclusively, jumping torque from 850 to 1,075 lb-ft. That’s the real reason most buyers cross-shopping this keyword end up choosing diesel: the Cummins now beats the HEMI on horsepower too, not just torque.

The trade-off runs the other way on weight and payload. The HEMI is roughly 500 pounds lighter than the Cummins, which is why Ram’s 2025 gas-engine payload rating reaches 4,420 lbs versus a lower figure for diesel-equipped trucks.

Real World 6.4 HEMI Performance and Towing Context

Horsepower numbers on a spec sheet don’t tell you what the truck does day to day. The 6.4 HEMI uses a Multi-Displacement System that shuts down four cylinders during light-load cruising, so it runs as an efficient V4 on the highway and switches back to all eight cylinders under load or acceleration.

On the towing side, the gas engine’s maximum rating sits at roughly 17,730 to 17,750 lbs depending on configuration, while the 2025 to 2026 Cummins High Output tops out at 20,000 lbs. Ram’s own testing puts the High Output Cummins at a 6.9 second 0-60 time, down from 8.0 seconds on the prior standard-output diesel, though Ram has not published an official 0-60 figure for the gas HEMI itself.

For the complete transmission pairing history across model years, including exactly when Ram moved from six-speed to eight-speed automatics on this engine, see our Ram 2500 6.4 HEMI 6-speed vs 8-speed transmission guide.

Ram 2500 6.4 HEMI Reliability at This Power Output

Running 405 to 410 horsepower out of a naturally aspirated pushrod V8 hasn’t created major reliability concerns at this output level. The two issues owners report most often are a lifter tick tied to the Multi-Displacement System and, on higher-mileage trucks, exhaust manifold cracking from repeated heat cycling under heavy towing.

Neither issue is tied specifically to the horsepower rating itself. For the full breakdown of what to watch for and by which mileage, see our Ram 6.4 HEMI common problems guide.

The Bottom Line on Ram 2500 6.4 HEMI Horsepower

If you’re looking at a 2014 to 2024 Ram 2500, the 6.4 HEMI is rated at 410 horsepower and 429 lb-ft of torque. For 2025 and 2026 models, that figure is 405 horsepower with torque unchanged. The difference comes down to Ram’s 2025 refresh, not a mechanical redesign.

Either way, the HEMI remains the lighter, lower-maintenance option next to the Cummins, which now outpaces it on both horsepower and torque since the 2025 High Output update. For a broader look at how this engine compares across the full Ram 2500 lineup, our Dodge Ram 2500 horsepower overview covers every engine option side by side.

Frequently Asked Questions

How much horsepower does the Ram 2500 6.4 HEMI have?

The 6.4 HEMI makes 405 horsepower in 2025 and 2026 models, and 410 horsepower in 2014 through 2024 models. Torque stays at 429 lb-ft across every model year.

Why do some sites say 410 hp and others say 405 hp?

The 405 hp figure applies to the refreshed 2025 and 2026 model years, while 410 hp was the rating through 2024. Ram has not published a specific explanation for the change, but the engine’s core architecture did not change.

Is the 6.4 HEMI or 6.7 Cummins more powerful?

The 6.7 Cummins is more powerful on both metrics as of 2025, making 430 hp and 1,075 lb-ft compared to the HEMI’s 405 hp and 429 lb-ft. Choose the HEMI if you want lighter weight and higher payload instead.

Has the Ram 2500 6.4 HEMI horsepower changed since 2014?

Yes. It held at 410 hp from 2014 through 2024, then dropped to 405 hp with the 2025 model year refresh. Torque has remained 429 lb-ft the entire time.

What’s the horsepower difference between pickup and cab-chassis 6.4 HEMI configs?

Pickup models are rated at 410 hp for 2014 through 2024, while cab-and-chassis versions of the same engine are governed to 370 hp due to a lower peak engine speed setting used for commercial upfits.