I just picked up an '09 and my 5th gear shows similar symptoms. When I'm just putzing aroung it goes in pretty nice, but under just a little load (not crazy) there is a noticeable "notch" into 5th. When merging onto the highway in 4th in high revs, shifting into 5th produces a horrible grinding sound...... so I skip 5th and go into 6th.
Taking it into my local dealership soon. Let me know what you find out, so I can provide more details to my tech.
Thanks
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Chris
'70 Datsun 2000 Roadster
'09 370z- Invidia, Stillen G3, ZEnclosure
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