Ram, Jeep and Dodge engines: Cummins, Hemi and more

By CarWhere Research · Updated November 3, 2026

The best-known engines in Ram, Jeep and Dodge vehicles are the 5.9 and 6.7 Cummins diesels in Ram heavy-duty trucks, the 5.7 and 6.4 (392) Hemi V8s and the supercharged 6.2 Hellcat, the 3.6 Pentastar V6, the 3.0 Hurricane six and the 2.0 turbo four. CarWhere covers 10 engines and 3 transmissions with years, ratings, 20 documented problems and 43 NHTSA recalls.

Stellantis shares these engines across its Ram, Jeep, Dodge and Chrysler brands, so one page serves every model that uses an engine — the Pentastar V6, for example, powers the Wrangler, Grand Cherokee, Durango, Charger and Ram 1500. Each page lists the model years, Stellantis-published output by application, design facts, documented problems with pre-purchase checks, and verified NHTSA recall campaigns.

Engine family overviews

5.9 Cummins: every generation compared — The 5.9 Cummins powered Dodge Ram heavy-duty pickups from 1989 to early 2007 in two families: the 12-valve (1989–1998, 160–215 hp) and the 24-valve ISB (1998.5–2007), which used the VP44 pump through 2002 and common rail from 2003, reaching 325 hp and 610 lb-ft.

Cummins diesel engines (Ram heavy duty)

Cummins diesel engines (Ram heavy duty): model years and peak Stellantis-published output
Engine	Model years	Peak output	Known problems	Recalls
12-Valve CumminsCummins 5.9L 6BT 12-valve turbo diesel I6 (Dodge Ram, 1989–1998)	1989–1993 · 1994–1998	215 hp / 440 lb-ft	3	0
24-Valve CumminsCummins 5.9L ISB 24-valve turbo diesel I6 (Dodge Ram, 1998.5–2007)	1998.5–2002 · 2003–2007	325 hp / 610 lb-ft	3	1
6.7 CumminsCummins 6.7L turbo diesel I6 (Ram heavy duty, 2007.5–present)	2007.5–2012 · 2013–2018 · 2019–2024 · 2025–present	430 hp / 1,075 lb-ft	2	8

12-Valve Cummins years, specs and problems — The 12-valve Cummins is the 5.9-liter 6BT inline-six diesel in 1989 to early-1998 Dodge Ram pickups.
24-Valve Cummins years, specs and problems — The 24-valve Cummins is the 5.9-liter ISB six used in Dodge Ram 2500 and 3500 pickups from mid-1998 to early 2007.
6.7 Cummins years, specs and problems — The 6.7 Cummins is the 6.7-liter inline-six turbo diesel in Ram 2500 and 3500 pickups since mid-2007.

HEMI V8 engines

HEMI V8 engines: model years and peak Stellantis-published output
Engine	Model years	Peak output	Known problems	Recalls
5.7 HemiChrysler / Stellantis 5.7L HEMI V8 (Gen III)	2003–2008 · 2009–present	395 hp / 410 lb-ft	1	4
6.4 Hemi (392)Chrysler / Stellantis 6.4L (392 cu in) HEMI V8	2011–2025 · 2014–present	485 hp / 475 lb-ft	1	2
6.2 HellcatStellantis supercharged 6.2L HEMI V8 (Hellcat family)	2015–2023 · 2018–2021, 2021–2024, 2027	1,025 hp / 945 lb-ft	0	3

5.7 Hemi years, specs and problems — The 5.7 Hemi is Chrysler's 5.7-liter pushrod V8, launched in the 2003 Ram at 345 hp and 375 lb-ft.
6.4 Hemi (392) years, specs and problems — The 6.4 Hemi, sold as the 392, is a 6.4-liter naturally aspirated HEMI V8.
6.2 Hellcat years, specs and problems — The Hellcat is Stellantis's supercharged 6.2-liter HEMI V8.

Six-cylinder and four-cylinder engines

Six-cylinder and four-cylinder engines: model years and peak Stellantis-published output
Engine	Model years	Peak output	Known problems	Recalls
3.0 HurricaneStellantis 3.0L Hurricane twin-turbo inline-six (Standard Output and High Output)	2023–present · 2023–present	550 hp / 531 lb-ft	0	0
3.6 PentastarChrysler / Stellantis 3.6L Pentastar V6	2011–present	305 hp / 269 lb-ft	2	5
3.0 EcoDieselVM Motori 3.0L EcoDiesel turbo-diesel V6	2014–2019 · 2020–2023	260 hp / 480 lb-ft	4	8
2.0 TurboStellantis 2.0L turbo I4 (GME-T4 / Hurricane 4), including the 4xe plug-in hybrid	2018–present · 2021–present · 2026–present	375 hp / 470 lb-ft	2	10

3.0 Hurricane years, specs and problems — The Hurricane is Stellantis's 3.0-liter twin-turbo inline-six.
3.6 Pentastar years, specs and problems — The 3.6 Pentastar is Stellantis's 3.6-liter DOHC 24-valve V6, used since the 2011 model year in the Wrangler, Grand Cherokee, Ram 1500, Durango, Charger and Challenger.
3.0 EcoDiesel years, specs and problems — The 3.0 EcoDiesel is a VM Motori turbo-diesel V6 used in the Ram 1500 from 2014 to 2023, the Jeep Grand Cherokee, and the Wrangler and Gladiator.
2.0 Turbo years, specs and problems — Jeep's 2.0-liter turbo four makes 270 hp and 295 lb-ft in the Wrangler and Cherokee.

Automatic transmissions

Automatic transmissions: model years and peak Stellantis-published output
Engine	Model years	Peak output	Known problems	Recalls
68RFEChrysler 68RFE six-speed automatic (Ram heavy duty, Cummins)	2007.5–2024	—	1	2
Aisin AS69RCAisin AS69RC six-speed automatic (Ram 3500 High Output Cummins)	2013–2024	—	0	0
8HP (TorqueFlite 8)ZF 8HP eight-speed automatic family (TorqueFlite 8: 8HP70, 8HP75, 8HP90, 8HP95)	2013–present	516 lb-ft rated	1	0

68RFE years, specs and problems — The 68RFE is Chrysler's six-speed automatic built for the 6.7 Cummins, used in Ram 2500 and 3500 pickups from mid-2007 through 2024.
Aisin AS69RC years, specs and problems — The Aisin AS69RC is the heavy-duty six-speed automatic Ram paired with the High Output 6.7 Cummins in the Ram 3500 from 2013 through 2024.
8HP (TorqueFlite 8) years, specs and problems — The 8HP70 is the ZF-designed eight-speed automatic Stellantis sells as the TorqueFlite 8.

Know which engine and transmission a truck was built with.

Ram builds the same truck with several engines, transmissions and axle ratios. 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 is the difference between the 12-valve and 24-valve Cummins?

Both are 5.9-liter inline-six Cummins diesels. The 12-Valve Cummins (1989–1993 · 1994–1998) has two valves per cylinder and a mechanical injection pump; the 24-Valve Cummins (1998.5–2002 · 2003–2007) has four valves per cylinder and electronically controlled injection, rated up to 325 hp / 610 lb-ft in Ram trucks.

How much horsepower does the 6.7 Cummins have?

Ram’s ratings for the 6.7 Cummins have climbed over the years, peaking at 430 hp / 1,075 lb-ft for the High Output version. The 6.7 Cummins page lists Ram-published output by model year and transmission.

What is the Hemi tick?

“Hemi tick” is owners’ name for a ticking noise from the 5.7 Hemi, most often traced to "hemi tick": lifter roller and camshaft lobe wear (2009+ Eagle engines (most reports 2011–2020)). The 5.7 Hemi page covers symptoms, affected years and what to check before buying.

Is the 392 Hemi the same as the 6.4 Hemi?

Yes. 392 is the displacement in cubic inches of the 6.4-liter Hemi V8 (2011–2025 · 2014–present), used in SRT and Scat Pack Dodges, the Grand Cherokee SRT, the Wrangler Rubicon 392 and Ram heavy-duty trucks, with different ratings by application.

What trucks have the 68RFE transmission?

The 68RFE is Ram’s six-speed automatic for heavy-duty pickups (2007.5–2024), paired with the 6.7 Cummins in standard-output trucks and with gasoline V8s. The 68RFE page lists applications and documented issues.

How do I find out which engine my Ram, Jeep or Dodge has?

The engine is encoded in the eighth character of the VIN, and the window sticker or build record lists the engine and transmission the vehicle was built with. A free VIN decoder shows the basic engine; a build sheet adds the factory options and packages.

Sources

Each engine page lists its own detailed sources. Key references across the guide:

Stellantis North America media — product information and specifications — Stellantis
NHTSA recalls database — National Highway Traffic Safety Administration
Safety Recall 21V880: 2019–2020 Ram HD with 6.7L Cummins (high-pressure fuel pump) — National Highway Traffic Safety Administration (NHTSA)
2013 Ram 1500 powertrain (TorqueFlite 8 eight-speed) press materials — Chrysler Group LLC media
2019 Ram 1500 powertrain press release (Jan. 15, 2018) — FCA US LLC media
New 2019 Dodge Challenger SRT Hellcat Redeye: Possessed by the Demon — Stellantis North America media
Stellantis Debuts Hurricane Twin-Turbo I-6 Engine (March 2022 release) — Automotive World (Stellantis release)
All-new 2026 Dodge Charger Scat Pack Drops the Hammer With 550 Horsepower — Stellantis North America media
Pentastar 3.6-liter V-6 engine technical release — Stellantis North America media
2019 Ram 1500 3.6-liter Pentastar V-6 with eTorque — Stellantis North America media

More Ram tools

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.