Ferrari Part Number 155850, COMPLETE PINION FOR 4TH GEAR shown here as used in Ferrari 456 GT/GTA Table 32 Main Shaft Gears And Gearbox Oil Pump -Not For 456 Gta. Location in Diagram: 51. Required Quantity: 1. This Ferrari part is used in more than one diagram. Click on the diagrams below to see alternative uses of this part: