reading that JWT flywheel thread made me think of the gear noise my Z has had. 06' obviously, and in first gear once i get over 2000 to around 4000 I get this weird whirring sound from the transmission. Anybody know what I'm talking about? ill get my friend to videotape me in first gear pullin along slow sometime.

 

i think i may be having the same issue.
a vid would help.