 His experiences from the American automobile industry was probably the main reason why Gustav Larson asked him to join the team of engineers that started the design work for Volvo's first automobile, ÖV 4, in 1924.He worked for Gustav Larson in the temporary "design office" in Gustav Larsons private flat in Stockholm about a year.A lot of Jan G. Smith's original drawings for the Volvo ÖV4, the gearbox, the main chassi components and technical papers that he had collected in America in the form of a private design book, are saved in the archive of the National Museum of Science and Technology, Stockholm, Sweden.