Toyota 14B gearboxThe Toyota 14B engine is a 3. 7L four cylinder diesel engine commonly used in Toyota commercial and industrial vehicles. Gearboxes compatible with the 14B engine are typically mated to vehicles designed for medium duty work. A Toyota 14B gearbox is most commonly found in and fits vehicles such as: Toyota Dyna (BU series) Light to medium duty trucks Models like BU60, BU61, BU88 Toyota Land Cruiser (Heavy Duty models) Certain 70 series heavy duty Land