Extreme-duty crown wheel and pinion for L140 Graziano transmissions pushed to the limit. 13:40 tooth count suits most Lamborghini Gallardo, and many Audi R8, and Aston Martin 6-speed manual gated transmissions. They are also very popular in many kit cars such as GT40s and many others. Gleason cut and profile ground, made from 9310 material to DIN4 quality or better.