Okay so my car actually does this too, no idea what really causes it. My mechanic also says it is fine and it doesn't seem to be causing any harm. I just attributed it to a quirk in my gtm upgraded transmission or tune.
It happens most of the time in third gear, but if I switch to 4th gear before it happens in third, 4th will engage at a lower than expected rpm cause it drops during the switch. If that makes any sense, lol. Maybe I can grab a video of mine too.
I really only drive my 7at in M-mode so I've gotten familiar with this little problem. It only happens under light acceleration/city driving before my oil/trans is up to temp. When I'm really going for it the shifts are perfect.
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2011 370z Supercharged Sport Touring 7AT
Stillen: Supercharger Kit | Cat Back/TP | Oil/AT Coolers
GTM: Hardened 7AT (valve body+torque converter)
Whiteline: 27mm Front | 24mm Rear | Swift Springs
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