Paolo M came to ZCG for a differential build on his 370z. The G35/350z and G37/370z cars all share the same diff bushing failure due to aggressive driving or simple wear and tear. From Nissan, the OEM diff bushing is filled with silicone, and will burst/leak this fluid resulting in a noticeable clunk when shifting. Paulo’s Z34 had the tell-tale sign of the diff bushing failure, with visible leakage on the cover:
Nissan will not replace the bushing alone. By design, Nissan wants you to replace the entire rear subframe at a substantial cost. Fortunately, Whiteline makes a really nice bushing that can be installed and it is a mandatory solution whenever we perform a diff job at ZCG. In addition to replacing the diff bushings, we replaced the bearings, changed the final drive and installed an OS Giken limited-slip unit:
The diff is removed from the Z and OS Giken LSD prepped:
We check the pinion depth by testing the wear pattern on the ring gear with paint:
For an added piece of security for the differential we installed a NISMO diff cover. Its extra oil capacity and finned design aid in cooling for hard driving. The unit was filled with OS Giken gear oil:
We finished with an engine oil change and Paolo was back on the road. He’s visited ZCG several times and we like working on his Z34. Enjoy The Ride Paolo!
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