Late April, and the spring finally arrived with temperatures making it possible to start on the pending repairs. I started by draining the oil from the noisy rear differential.
The output shafts have significant play, which is an indication of worn clutch packs and belleville washers, and possibly broken output shaft stubs (I will find out when I disassemble the differential later). With all these issues, this differential needs a complete rebuild. It is hard to find specialists with the knowledge and the tools required to perform this work in Norway. The cost of shipping the differential to the USA and back for a rebuild is also excessive, due to the weight. So, the conclusion was to purchase a built 4.10 differential, which obviosly also gave the opportunity to change to a different gear ratio.
Built 4.10 differential
- C6 Z06 output stub shafts
- C7 Z06 clutch packs
- Motive 4.10 ratio ring and pinion gear
- New bearings, carriers and seals
To ensure that history does not repeat itself, I'm not on a track day again until a differential oil cooler is in place (and possibly a transmission oil cooler too).