Hey guys! I drive a 2010 G37x Sedan, When i shift 3rd gear to 4th it shifts hard and theres also a "shift flair" , if any of you guys have experienced this and fixed it please let me know, i took it to a mechanic and he told me it was a transfer case coupling and that infiniti had a bulletin for it, i took it to infiniti and they did the TCU/ECU Update and the problem exists, i asked them what do i need to do to fix it and they said i would have to buy a new transmission from them for 10,000 dollars. My car is not even worth that much LOL. My car has 129k miles, it just ruins my experience when im driving and it jerks me and the passengers back in the seat after shifting from 3rd to 4th. It only shifts hard/ flairs when my foot is on the gas, if i let go of the gas and shift, it shifts perfect. What do you guys think ? Any help would be appreciated, My current mods are - Q300 CBE, and Takeda CAI

 

Here’s a video https://www.dropbox.com/s/vu6tqpijog...%20AM.mov?dl=0

 

I have the same issue, but it only happens when I'm driving fast, and shifting down and up from 3rd to 4th, but I haven't had any issues with it. I drive a 2011 g37xs coupe, and it did the same thing in my 2013 g37 coupe also. You can get your car tuned where the tuner can play around with the transmission software, and get it too shift a bit smoother. But it is a common issue with this transmission, it is slow, and just shifts hard.

 

My car had the same issue discussed here when shifting 3rd to 4th. Sometimes the rpm would flare a couple hundred rpm and finally shift.

My car is tuned now and still has the same 3-4 shift issue even though my transmission shifting has been adjusted.

This doesn't happen all the time, but it does happen from time to time. Seems like a very common thing for 7AT owners.

 

Did the tune help with the shifting at all? I’m thinking it may be a solenoid or software related. Just really stuck at the moment. Does it make a *thump* noise and jerk you in your seat when you upshift from 3rd at high RPMS? Cause that’s what’s mine doing as well

 

Yes mine jerks and makes a loud sounds also. Once i downshifted from 4th to 3rd and the car did not know and then it just shifted a bit harsher than usually.

 

My transmission has been hard shifting lately but it seems like it happens from 1st to 3rd gears. I have 75k miles and it was all smooth until recently. I am taking my car in Tuesday to get a transmission change and I let them know about it and they said they will take a look at it.

 

I’m having this same problem, did you ever figure it out?

 

Did you check the megathread here? Sounds like the Harsh upshift/downshift TSB thats software related, it will remove your tune, but sounds like what you need.

 

Let’s say I’m going 40 down a hill and I shift from 4th to 3rd once in a blue moon instead of getting the immediate vroom of my engine speeding up and matching the transmission, it will lag for 2 seconds like the torque converter didn’t lock up right then boom it will slam into gear not like throwing me into my seat but very noticeable. Only like once a week it does this and I don’t do any bull **** driving In my car I don’t even like to rev match it but sometimes it’s fun

 

4-3 3-2 and 2-1 should all be a lil harsh with some motion, 5+ up and down are smooth right? For example, when you slide all the way up to 7th gear after 60mph+ smoothly. The downshifts can be harsh but if its real jerky, like REAL jerky rocking back and forth, maybe look at some fluid levels and or replacement intervals. The delay can also be related to the computer wanting to NOT grind the gears. I don't think the TCM will let you smash the gears together and will "wait" for a shift than force gearclash.

 

i have the same problem currently going on I changed spark plugs and coils got oil change new head gaskets fluids replaced etc. anything I thought was wrong with it I fixed to stop hard shifting I then got tired of spending money and got it checked out the guy told me my transmission is in perfect condition with 90k miles on it and it’s the best one he seen so far I then realized it’s just the car and there’s no fixing