Volkswagen CAV gearboxThe VW CAV gearbox is commonly associated with certain Volkswagen models, particularly those equipped with small displacement petrol engines from the early 2000s. This gearbox is typically a 5 speed manual transmission. Vehicles that can be fitted with a CAV gearbox include: Volkswagen Polo (9N series) Produced around 20022005, often paired with 1. 4L petrol engines. SEAT Ibiza (Mk3, 6L) Equipped with similar 1. 4L petrol engines.