so, i went to a "Z" site to find info on a 3.9 ring and pinion set. the page says "for 6 speed mt only".
this is the first time i've heard of this. anyone know why?






i guess if it really isn't an issue, i could just pull the 4.08 gears from a nissan truck, maybe cheaper? and yes, a nismo diff cover too while i'm at it.

 

Currently being discussed in this thread.
https://my350z.com/forum/engine-and-drivetrain/371536-3-9-fd-on-automatic.html