Just got myself a 2004 Z and the rear axels are clicking like mad, even when changing from 1st to second.
Talked to Mr. Nissan and they said they had a few in with the problem and to turn and grease them would cost £150! also they would inspect them and they may require new shafts! Bollocks to that, it's not even 4 years old yet and it may require new drive shafts!
Surely Nissan should be subsidising this fix!