missing 2nd gear at high rpm / WOT

lhinojos

I'm 100% sure that if I go from 2nd to 6th at any rpm it'll grind, heck if Im not sure to rev match the shift into 6th, it WILL grind. Question is, how do I get nissan to replace the trans? Especially because Nissan has to replicate such "problem". What do I have to tell them to look for?

Volk Z

Here's the thing you can't bring a random intermittent problem into Nissan.. Here's the good news (well sort of) your synchros won't get any better. My 03 transmission issue started with a slight grind and this was sitting in a parking lot clutch all the way in not moving!the synchro got worse by the day...

So that being said you have 2 options kill the synchro... Power shift the crap out of that tranny or wait until it goes because if it isn't good now it will only get worse every shift

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houkouonchi

I sometimes get grind (or a crunch) going from 1st to 2nd when doing full acceleration and its caused by shifting a bit to fast for the synchro's. If you shift a bit slower you will probably be ok. I don't ever have this problem with anything but 1st to 2nd.

Kayzee

See the freaking point is we're driving a sportscar and a 1->2 shift in a very quick fashion is ridiculously important, when we decide that we need it.


To make an automatic tranny that shifts in under 100ms is no problem, but to come up with a synchro that would let us do the same by hand is too difficult?

I swear to god once i'm done with grad school in 3 years I will do my PhD research on this or something

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CDepp

When I see people post 'shift slower' I hear, "you have a sports car, but don't accelerate as hard as if it were a true sports car". I've taken out a 2009 and 2010 from a dealership after mine started acting up and the another dealership said 'it's normal'. I couldn't replicate the issue on the others, and I drove them harder than I do my own. I took the Service Mgr out for a drive in mine, chewed up some gears from 1st to 2nd under hard acceleration, "shift slower", he said. I pulled over and stared at him for at least 15 solid seconds, then pulled back out. I wanted to ask him if he was drunk, but held my tongue. I shifted slower, from 6500 RPM in 2nd (approx. 45mph or so) to 6th with a full 1 second delay. Same horrible grinding. "Oooooh. That's not right", he said.

"Not normal? You sure?" - I asked in a very demeaning tone.

(I'm an @$$ most of the time)

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-CDepp-
2011 MB Base+S M6 | Invidia Exhaust | TommyKairaHebiBeibi | H&R Spacers 15/20 | GTR Start | 305hp/240tq