Finally back on the road...sort of

In August 2022, I returned home from a track day event with a broken differential and cracked rear brake rotors. I already knew that the differential was overdue, as it there was a high buildup of metallic particles in the differential fluid. With a mileage of 170.000 km (106k miles), I decided it was time to replace all other parts accessible after removing the torque tube, transmission and differential.

From August 2022 to April 2024, time was spent to disassemble the drivetrain, saving up money for parts, waiting for parts to arrive and doing the actual work:

• Removing the drivetrain
• New built 4.10 differential with C6 Z06 internals
• Rear engine seals, gaskets and barbell replacement
• Spec Stage 2 clutch kit with aluminium flywheel
• Pilot bearing replacement
• Slave cylinder shimming and Hinson remote bleeder
• Torque tube maintenance
• M12 transmission extension housing oil leak
• Upgrades
• Larger 330 mm rear brakes from C6 Z51
• Shorter rear brake lines
• C6 tunnel plate upgrade
• Reinstalling the drivetrain

During the first test drive, I unfortunately discovered a few issues that needs to be addressed

1. The Spec II clutch kit does not work well with the stock master cylinder. The clutch is dragging and causing gear lock out and it is almost impossible to shift from high RPMs. A google search indicates that the solution is a Tick adjustable master cylinder, which increases the throw of the master and moves more fluid, which again allows the slave to expand the additional distance required to fully free the clutch
2. The ECP radiator installed 4 years ago is leaking coolant
3. The rear wheel bearings need urgent replacement. They were fried together with the brakes, so the lubrication has dried out and the bearings make a terrible noise
4. The external engine oil cooler does not perform as expected. It helps to lower the temperature, but far from enough. I'm removing it from the car to come up with a better solution later.

Update 15. June

1. New Tick master has resolved all issues with the clutch and gearshifts.
2. Temporarily reinstalled OEM radiator
3. New SKF bearings installed, no more noise
4. Temporarily removed oil cooler, until I can come up with a better location for it.