6.4 Hemi (392): years, specs & known problems

By CarWhere Research · Updated

The 6.4 Hemi, sold as the 392, is a 6.4-liter naturally aspirated HEMI V8. It made 485 hp and 475 lb-ft in the Challenger and Charger Scat Pack, 470 hp and 470 lb-ft in the 2021–2025 Wrangler Rubicon 392, and 410 hp and 429 lb-ft in Ram 2500 and 3500 trucks from 2014, rated 405 hp for 2025.

The 392 takes its name from its displacement in cubic inches, a nod to the 1950s Chrysler 392 HEMI. In cars and SUVs it is tuned for power: the Challenger and Charger R/T Scat Pack were rated 485 hp and 475 lb-ft, and the Jeep Wrangler Rubicon 392 that arrived for 2021 made 470 hp and 470 lb-ft before a Final Edition closed out the run in the 2025 model year. The Grand Wagoneer also used it for 2022–2023 before switching to the Hurricane High Output six.

Ram introduced a truck-tuned 6.4 for the 2014 Ram 2500 and 3500, rated 410 hp at 5,600 rpm and 429 lb-ft at 4,000 rpm, and it became the heavy-duty trucks' gasoline engine; for 2025 the rating is 405 hp with the same torque. The 6.4 shares the 5.7's pushrod layout and is named alongside it in the Hemi tick class action. Our check of NHTSA records found no recall specific to its internal parts; recalls listing the 6.4 cover shared electrical parts.

6.4 Hemi (392) at a glance

Chrysler / Stellantis 6.4L (392 cu in) HEMI V8: model years, fuel and peak Stellantis-published output by version
EngineModel yearsFuelPeak hpPeak torque (lb-ft)Documented problemsRecalls
6.4L 392 HEMI in SRT, Scat Pack and Jeep models2011–2025Gasoline (premium recommended in performance models)48547502
6.4L HEMI in Ram 2500 and 35002014–presentGasoline41042910

CarWhere lists 1 documented problem and 2 NHTSA recalls for the 6.4 Hemi (392), each with a source.

6.4L 392 HEMI in SRT, Scat Pack and Jeep models

High-output tune of the 6.4-liter HEMI used in Dodge SRT and Scat Pack muscle cars, Jeep Grand Cherokee SRT, Durango SRT, the Wrangler Rubicon 392 and the 2022–2023 Grand Wagoneer.

6.4L 392 HEMI in SRT, Scat Pack and Jeep models specifications

6.4L 392 HEMI in SRT, Scat Pack and Jeep models: design facts (2011–2025)
SpecificationValue
Displacement6.4 L (392 cu in)
ValvetrainPushrod (OHV), 2 valves per cylinder
Wrangler 392 run2021 model year launch; Final Edition extended into the 2025 model year[3]
Grand WagoneerReplaced by the 3.0L Hurricane High Output for 2024[4]

6.4L 392 HEMI in SRT, Scat Pack and Jeep models horsepower and torque by year

6.4L 392 HEMI in SRT, Scat Pack and Jeep models: Stellantis-published horsepower (hp) and torque (lb-ft) by model year and application
Model yearsApplicationHorsepower (hp)Torque (lb-ft)Source
2019Challenger R/T Scat Pack485475[1]
2021–2025Jeep Wrangler Rubicon 392470470[2]

"—" means we could not confirm the figure from a primary source.

Which vehicles have the 6.4L 392 HEMI in SRT, Scat Pack and Jeep models?

Models and model years offered with the 6.4L 392 HEMI in SRT, Scat Pack and Jeep models
ModelModel yearsNotes
Dodge Challenger SRT 392 / R/T Scat Pack2011–2023
Dodge Charger SRT 392 / R/T Scat Pack2012–2023
Jeep Grand Cherokee SRT2012–2021
Dodge Durango SRT 3922018 and later
Jeep Wrangler Rubicon 3922021–2025
Jeep Grand Wagoneer2022–2023

6.4L 392 HEMI in SRT, Scat Pack and Jeep models recalls

NHTSA safety recalls related to the 6.4L 392 HEMI in SRT, Scat Pack and Jeep models (campaign numbers link to NHTSA)
NHTSA campaignReportedVehiclesSummary
15V1152015-022012–2013 Jeep Grand Cherokee with the 3.6L, 5.7L or 6.4L (and Durango 3.6L/5.7L)339,525 vehiclesThe fuel pump relay inside the TIPM-7 power module can fail and stall the vehicle without warning. Dealers fit a relay outside the TIPM.
19V8132019-112011–2013 Dodge Durango and Jeep Grand Cherokee with the 3.6L, 5.7L or 6.4L previously repaired under 14V530 or 15V115528,594 vehiclesFollow-up campaign: the TIPM fuel pump relay could still fail and stall the vehicle; dealers replace the relay and related wiring harness.

6.4L HEMI in Ram 2500 and 3500

Truck-tuned 6.4 introduced for the 2014 Ram Heavy Duty as an option over the 5.7, then the heavy-duty trucks' gasoline engine. The launch trucks paired it with a six-speed automatic; it was the first gasoline engine offered in the dual-rear-wheel 3500.

6.4L HEMI in Ram 2500 and 3500 specifications

6.4L HEMI in Ram 2500 and 3500: design facts (2014–present)
SpecificationValue
Displacement6.4 L (392 cu in)
Peak rpm (2014 rating)410 hp at 5,600 rpm; 429 lb-ft at 4,000 rpm[5]
Launch transmission66RFE six-speed automatic[5]

6.4L HEMI in Ram 2500 and 3500 horsepower and torque by year

6.4L HEMI in Ram 2500 and 3500: Stellantis-published horsepower (hp) and torque (lb-ft) by model year and application
Model yearsApplicationHorsepower (hp)Torque (lb-ft)Source
2014–2024Ram 2500/3500410429[5]
2025Ram 2500405429[6]

"—" means we could not confirm the figure from a primary source.

Which vehicles have the 6.4L HEMI in Ram 2500 and 3500?

Models and model years offered with the 6.4L HEMI in Ram 2500 and 3500
ModelModel yearsNotes
Ram 25002014–present
Ram 35002014–presentFirst gas engine offered with dual rear wheels
Ram Power Wagon2014–present

6.4L HEMI in Ram 2500 and 3500 problems and what to check

"Hemi tick": lifter roller and camshaft lobe wear (2014–2022 trucks named in litigation)

Major repair

The 6.4 shares the 5.7's pushrod valvetrain and is named in the Petro v. FCA US LLC class action, which alleges ticking, lifter and camshaft failures in 2014–2022 Ram 2500/3500 and other 6.4L vehicles. Those are allegations, not court findings, and there is no recall. Owner reports describe the same pattern as the 5.7: a lifter roller stops turning and wears a cam lobe.[7][8]

Symptoms

  • Rhythmic ticking from the top of the engine that does not fade when warm
  • Misfire codes on one cylinder, often with a rough idle
  • Loss of power or a check-engine light under light load

Check before buying

  • Listen at idle with the hood open after the engine is fully warm
  • Scan for stored misfire codes and ask whether any cylinder has repeated misfires
  • Ask for records of a camshaft and lifter replacement and what parts were used

6.4 Hemi (392) issues by model

The same engine shows up on these known-issues pages, with model-specific details.

Related Ram, Jeep and Dodge research

Confirm a vehicle really has the 6.4 Hemi (392).

The engine a Ram left the factory with is part of its build record. The CarWhere Ram build sheet reconstructs factory colors, options and packages from licensed VIN-level build data — availability is checked free, and it is $9.99 only when detailed build data is found for that VIN.

Ram build sheet by VIN

Frequently asked questions

What does 392 mean on a Hemi?

It is the engine's displacement in cubic inches. 392 cubic inches is 6.4 liters, so the 392 Hemi and the 6.4 Hemi are the same engine family.

How much horsepower does the 6.4 Hemi make?

485 hp and 475 lb-ft in the Challenger and Charger Scat Pack, 470 hp and 470 lb-ft in the Wrangler Rubicon 392, and 410 hp and 429 lb-ft in 2014–2024 Ram heavy-duty trucks, rated 405 hp for 2025.

Is the Wrangler 392 still made?

No. Jeep ended the Wrangler Rubicon 392 with a Final Edition that was extended into the 2025 model year.

Does the 6.4 Hemi have the Hemi tick problem?

The 6.4 uses the same pushrod lifter design as the 5.7 and is named in the Petro v. FCA class action over lifter and camshaft failures. There is no recall, and the claims are unproven allegations.

Is the 6.4 Hemi the same as the Hellcat engine?

No. The Hellcat is a supercharged 6.2-liter HEMI with a different bore and stroke. The 6.4 is naturally aspirated.

Sources

Ratings are Stellantis-published figures as cited; descriptions are CarWhere’s own summaries of the sources below. Repair costs appear only where a source states them and vary by shop and region.

  1. New 2019 Dodge Challenger SRT Hellcat Redeye: Possessed by the Demon — Stellantis North America media
  2. 2021 Jeep Wrangler Rubicon 392 Revealed: 470-HP Hemi V8 — Motor1
  3. Jeep Wrangler 392 Final Edition Continues Sales Into 2025 — Cars.com
  4. Jeep's Large SUVs Lose Their V8 Engines for 2024 (Nov. 2023) — Guide Auto Web
  5. 2014 Ram Heavy Duty to Feature All-New V-8 Engine and New Rear Suspension System — Automotive Fleet
  6. 2025 Ram 2500 Specs, Features & Options — Kelley Blue Book
  7. Chrysler Built Hemi Engines With A Major Engineering Defect (March 2020) — Jalopnik
  8. Chrysler HEMI Engine Ticking Noise Lawsuit (Petro v. FCA US LLC, May 2022) — CarComplaints.com (secondary reference)

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Independent reference compiled by CarWhere — not affiliated with or endorsed by Stellantis or Cummins Inc. Ram, Jeep, Dodge, HEMI, SRT, Hellcat, Hurricane and the model names are trademarks of their owners.