The man tasked with this impossible geometry was , a young engineer who had worked on the R16. His solution became Project 104 . 2. The DF104: The Mechanical Mule Before the styling clay or the marketing plans, there was the DF104 —a codename standing for Direction des Fabrications / 104th project . This was not a car for the public; it was a rolling test bed.

Driving a Peugeot 104 today, you feel the ghost of Renault’s failure: a flat floor, a whining gearbox, and a bonnet that seems absurdly long for such a tiny car. That is the DF104—the prototype that lost the battle but defined the architecture of the modern small car.

The DF104 chassis was a revolutionary concept: a mounted ahead of the front axle but behind the transmission. Wait—longitudinal? In a small car?

Renault, still reeling from the 1968 civil unrest and facing aging rear-engined models like the Renault 8 and 10, needed a modern voiture à vivre (a car for living). The directive from the Régie Nationale des Usines Renault was brutal: Create a car smaller than the R4, cheaper than the R6, but as spacious as a R16 inside.

Note: The Renault DF104 is not a mass-production consumer vehicle. It is a specific, high-stakes prototype from the early 1970s that served as the mechanical and architectural mule for what would eventually become two of the most influential European cars of the decade: the Renault 5 (R5) and the Peugeot 104. 1. Genesis: The Post-68 Automotive Revolution By 1969, the European automotive landscape was shifting. The Mini had proven that maximum interior space could be wrestled from a minimal footprint, but its transverse engine, gearbox-in-sump layout was idiosyncratic and expensive to cool. The Fiat 127 (1971) was on the horizon, threatening to redefine the A-segment with a transverse engine and efficient use of space.

Peugeot bought the architecture of the DF104. They shortened the wheelbase, moved the radiator to the side (a novel fix), and crucially, they —something no other supermini dared to do.