Why choose a cotta transmission gearbox? A Cotta transmission gearbox – crafted and matched to meet your specific needs – is one of the most reliable, durable, and powerful products available in our industry. We take great pride and care in designing a gearbox… your gearbox.How many cotta product designs does pj have to order? PJ has over has 5,000+ Cotta product designs ready to order today. With our direct access to Cotta engineers, PJ can work with Cotta to design an engineered solution for you unique transmission application.