I have an 08 G37. Soon after I bought the car I noticed a whine that would change in pitch in between gears, and my engagement point was way too high. That transmission was replaced under warranty. The new transmission developed the same whine, but even nastier. It's almost a howl at this point. On top of that, there is tapping/clicking noise upon engagement. The whine/howl goes away if the clutch is pressed in. But the tapping can be heard intermittently when the clutch is pressed in. None of my local Infiniti dealerships want to deal with it. The transmission is also very notchy, and slightly lurches forward when going into first. I'm pretty sure it's the throw out bearing that's making all the noise. I'm probably just going to get the heavy duty zspeed throwout bearing, along with the South Bend clutch kit/flywheel.
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