It was the first series production Csepel vehicle, and a copy of the Austrian Steyr 380 lorry, built under licence.

This later allowed Csepel Autógyár to build modified versions of the original WD-413 engine.

Mihály Zsofinyecz, Hungarian minister of heavy industries, formally accepted the plans for the factory on 18 November 1949.

[4] Approximately the first 1000 engines made at Csepel Autógyár were assembled from Austrian-made parts.

The Csepel D-350 is a copy of the Steyr 380, and thus shares many technical characteristics with the aforementioned lorry.

The lorry can approach angles of up to 21° up front, and 17° up rear; the turning diameter measures 16.8 m.[6] The specific ground pressure is 2.6 kp/cm2 (0.25 MPa).

[8] The torque is sent from the engine through a single-disc dry clutch to a non-synchromesh five-speed manual gearbox.

The sealing of the engine's pushrods was also improved, as well as the fan shaft nut's washer, and the securing of the clutch release lever.