Were you using the SRM? I'm curious if the transmission failures are occuring in cars driven solely using SRM, driven without SRM and attempted to rev match manually, or without SRM and no attempts at rev matching on shifts.

SRM should have nothing at all to do with this. It actually has little to do with the transmission really, except for the microswitches at the shifter which send the signals to the computer to do the engine rev match. Syncro and gear failures are stictly mechanical issues..

Correct me if I am wrong but I thought there was a small magnet on top of the tranny that lines the syncros up to perform the blip.

More interested in driver miscalculation during engine rev matching during shifts as a possible cause to premature failure. My thought is that SRM would minimize the effect of poor rev matching which could contribute to premature transmission wear.

Syncros have to work just as hard downshifting with or without SRM rev matching since it's not a true double clutch match.....Doubt it would make a difference...

4500 miles and no issues to speak of. Then again, I don't use 6th all that often. Usually only when the MPH heads north of 80 on the highway. I treat it more like a cruise control gear if that makes any sense... In other words, no stop and go traffic, long highway runs, etc.

I agree with you, SRM is designed to smooth out gear changes and balances the chassis. In fact it might actually avoid damages to your transmission while downshifting! It’s a great feature but heel and toe is still more fun but not as accurate as the computer!

I already got mine replaced once... it was the synchros.. they replaced the whole trans

Did they explain to you how the synchro contributed to the failure??

Nope just took it and replaced it.. the tech pulled the trans off and put the new one on in like 4-5 hours lol.. i was impressed.

Here's a better solution: forget 7AT or 6M, just cut a big hole in your floor board and scream "yabba, dabba doooooo!!!!!!!!!!!" and you'll shift faster than any tranny for that matter :)

now that makes no sense cause fred's feet are the engine.
we're talking about transmissions here...

Like any car, there are bound to be some problems, but there have been a number of posts on this board of new buyers of MT who have never driven one and asking advice whether they can do it. There was also a thread where it was stated that someone discovered that they didn't need to fully depress the clutch to shift. And we know a few are drivin the sh.. out their cars and a missed shift etc is possible. So lets not blow this out of proportion until there are more reports or we understand more of potential causes.

Looks like it's just a rotational (RPM) speed sensor Lou...Check the pic at the link....:
2009 Nissan 370Z's SynchroRev Match Explained - Tech Dept. - Auto Reviews - Car and Driver

Ever hear of the snap ring issue with the NSX transmission? It could be something as simple as a tolerance stacking issue. I suspect NISSAN will be working on this.