Ferrari 250 Transmission

After overhauling dozens and dozens of Ferrari transmissions I have a good idea on what to expect when the case is opened up and shafts are broken down. Whether it’s a 250 GTE 4 speed, a 246 GT Dino trans-axle or a 330 GTC/Daytona style 5 speed trans-axle,  synchronisers on Ferrari’s do not last many miles however, the rest of the components are over built and hold up well.. The bearings and gears are over built and the machined parts like flanges and shafts are impeccably machined using incredibly hard steel. The transmissions have oil pumps that pressurize the main and lay shafts to keep everything thoroughly lubricated so the bearings that the gears turn on are flooded in a pillow of oil.

This transmission out of this 250 shifted well but had the typical severely worn synchronisers so I was prepared to perform the “normal” repair of cleaning, inspecting and replacing the end bearings and synchros. This trans had been run without oil for a long time and the bearings in the photo were so wiped out that there was about .020″ clearance between the gear and bearing where there should only be about .005″. How did this thing work at all?

250 GT transmission overhaul

250 GT transmission overhaul

Transmission overhaul bearings

Transmission overhaul bearings

Bearings Ferrari transmission

Bearings Ferrari transmission

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