Stellantis and Tata Motors Passenger Vehicles (TMPV) have signed an agreement to expand their partnership beyond manufacturing to include vehicle development, technology, platforms and vehicle architecture.

The companies plan to develop vehicles for more than 50 global markets and manufacture them in India, extending a relationship that spans more than two decades. The agreement formalises plans for a new Jeep SUV based on Tata Motors' ARGOS vehicle architecture.

Internally known as J1J by Stellantis, the mid-size SUV is expected to be offered with internal combustion engine (ICE) and electric powertrains, potentially using the same powertrains as the Tata Sierra. A range-extender electric vehicle (REEV) configuration is also under consideration, although a production decision has not been finalised.

The expanded partnership follows an agreement signed in February to explore cooperation in manufacturing, engineering and supply chains. Until now, the relationship has primarily focused on vehicle manufacturing through Fiat India Automobiles Ltd (FIAL), their 50:50 joint venture.

Under the new arrangement, Stellantis will have access to Tata Motors' vehicle architecture and technologies, which it plans to combine with its own engineering and product development capabilities to develop vehicles for international markets. The agreement reflects India's role in engineering, product development and exports as automakers seek to serve international markets from the world's third-largest car market.

ARGOS platform and production plans

ARGOS stands for All-Terrain Ready, Omni-Energy and Geometry Scalable. It is TMPV's modular, multi-energy vehicle architecture, designed to accommodate different vehicle dimensions and powertrain configurations. Stellantis could use the platform to develop additional models in the future.

Tata Motors manufactures the Sierra at its Sanand factory in Gujarat, while the Jeep J1J is expected to be produced at the FIAL joint venture facility in Ranjangaon, Maharashtra. Manufacturing operations at the plant are expected to be adapted for the programme over the next 18 months.

A project team based in Pune is working on adapting the architecture for the Jeep model, including developing a left-hand-drive version for overseas markets. The programme forms part of Stellantis' plan to sell 100,000 locally produced vehicles globally in 2028 across its Tata Motors and Dongfeng partnership programmes combined. The target, outlined at the company's May 2026 Investor Day, covers several products rather than the J1J alone. According to sources, Stellantis is likely to launch the first vehicle under the programme in the first half of 2028.

Stellantis disclosed its intention to develop a Tata-based Jeep at its Investor Day on May 21st, 2026. Gregoire Olivier, the company's Asia Pacific chief operating officer, said Tata Motors would provide a platform for a new Jeep vehicle to be developed and assembled in India through the existing joint venture for global markets.

Olivier also outlined plans to export vehicles to more than 50 countries across the wider portfolio, including the Dongfeng programmes, the Tata-based Jeep and India's existing Citroën Smart Car programme. The specific export markets for the J1J have not yet been determined.

Jeep design and potential 4x4 capability

According to company sources, Stellantis is benchmarking the Jeep Renegade and Compass during the development of the J1J. The model's final production design and name have not yet been determined.

Although the Jeep is expected to share the underlying ARGOS architecture and components with the Sierra, it will have a different upper body, exterior styling and cabin. Expected changes include the seating layout, interior features and equipment.

Much of the underlying platform is expected to remain unchanged, with structural modifications and reinforcements introduced where necessary to accommodate the Jeep body and meet crash-test requirements and overseas regulations. Details of Jeep-specific suspension tuning and off-road hardware have not yet been established.

A four-wheel-drive (4x4) version is also under consideration, in line with Jeep's brand guidelines, which call for a 4x4 option across its model range. The electric Sierra already offers 4x4 capability, and the ARGOS architecture has been developed to accommodate an ICE-based 4x4 drivetrain. The Jeep programme could therefore support the development of a 4x4 version of the Sierra, potentially timed to coincide with the launch of the next-generation Jeep SUV.

TMPV is expected to retain ownership of the ARGOS architecture and license it to Stellantis. Existing Sierra suppliers are likely to supply components for Jeep production where parts can be shared. Model-specific components will require separate sourcing and tooling.

Commercial implications for both companies

For Stellantis, access to Tata Motors' architecture and supplier base could reduce vehicle development expenditure and support the addition of a new Jeep model to its global portfolio. For TMPV, licensing the architecture could generate revenue and distribute platform development costs across a larger number of vehicles. Suppliers could also receive higher production volumes through the use of common components.

The programme would expand the FIAL joint venture's role from manufacturing cooperation to producing a Jeep based on Tata Motors' vehicle architecture. The planned left-hand-drive version would allow the facility to supply markets beyond India and other right-hand-drive countries.

The arrangement could also allow Stellantis to expand the Jeep range within shorter development timelines. The brand has operated in India for close to a decade but has maintained a limited presence in the domestic market, with relatively few product developments. A licensed modular architecture capable of supporting different powertrains, wheelbases and 4x4 configurations could allow additional models to be developed within shorter timeframes.

The agreement extends the partners' cooperation in manufacturing, powertrains and supply chains to vehicle architecture and product development. An email seeking comment from Tata Motors and Stellantis had not received a response at the time of publication.