I ordered from Z1. Call them to make sure you get the parts you need (OEM standard diff and sport VLSD require some different parts.)
1 x Quaife Differential = $1,228.00
Model Base 6MT
Additional Parts Stub Axle Flange
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1 x Nismo Differential Cover = $139.00
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1 x OEM Side Bearings and Seals for 370Z = $130.00
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I have a GREAT speedshop nearby (MAC Autosports in Denver) that installed and filled with fluid for $400
I posted some pics and details
here on my build thread
I do
not recommend this as a DIY. if you can find a good race shop they will probably do better than the local AAMCO or generic tranny shop for an install. Getting your shims right in order to set proper gear spacing is a bit of an art. Ask you installer if he is familiar with this install.