Who makes Ram engines?
Ram engines are produced by multiple manufacturers: Stellantis (in-house) for gasoline engines like the Hemi and Pentastar, VM Motori for the EcoDiesel 3.0L, and Cummins for the heavy‑duty diesel.
Ram, the pickup and van brand now part of Stellantis, relies on a mixed supply chain to balance power, efficiency and durability across its lineup. This article explains which companies build the engines behind Ram's lineup and what that means for owners and service networks.
Gasoline engines: in-house Stellantis designs
The Ram gasoline lineup draws on engines developed and built within Stellantis, with variants tuned for payload, torque, and efficiency across Ram 1500, 2500/3500 HD, and ProMaster vans.
- 5.7L Hemi V8 — a hallmark of the Hemi family, designed and built by Stellantis (FCA lineage) for strong performance and straightforward service within the Stellantis network.
- 6.4L Hemi V8 — a larger displacement V8 in the Hemi family, also produced by Stellantis for high-tow capability and performance.
- 3.6L Pentastar V6 — a versatile modular engine produced by Stellantis for Ram and other brands, offering balanced power and efficiency.
In short, Ram's gasoline engines are primarily Stellantis-internal designs, manufactured at the group's own engine plants around the world.
Diesel engines: EcoDiesel and heavy-duty Cummins
Ram's diesel options come from two specialists: VM Motori provides the 3.0L EcoDiesel V6 for lighter, more efficient Ram models; Cummins supplies the heavy‑duty 6.7L Turbo Diesel for Ram 2500/3500 level workhorses.
- 3.0L EcoDiesel V6 — developed by VM Motori and produced under contract with Stellantis, used in Ram 1500 and related models for enhanced fuel economy.
- 6.7L Cummins Turbo Diesel — engineered and built by Cummins for the Ram heavy‑duty lineup (2500/3500), delivering high torque for towing and payload.
These two diesel families illustrate Ram’s dual-diligence approach to torque, efficiency, and durability in different market segments.
What this means for buyers and service
For buyers, the engine's origin can influence maintenance networks, parts availability, and performance characteristics. Gasoline Hemi and Pentastar engines are supported by Stellantis' global dealer and service network; VM Motori’s EcoDiesel is serviced via Stellantis channels with VM components; Cummins-powered HD diesels require Cummins-certified service and parts support for optimum reliability and uptime.
Summary
Ram engines come from three primary sources: Stellantis' in-house gasoline engines (5.7L Hemi, 6.4L Hemi, 3.6L Pentastar), VM Motori's 3.0L EcoDiesel (for lighter Ram trims), and Cummins' 6.7L Turbo Diesel (for heavy-duty Ram trucks). This mix reflects Ram's strategy to offer a broad range of power, efficiency, and capability across its lineup.
