You have a transmission dipstick if you have an 08 g37 automatic. Its located on the passenger side behind the engine cover. You should check the level, and see where its at. I had that issue when my transmission was low in fluid. I ended up draining the fluid from under the transmission, and refilling through the dipstick. All my shifting lag and clunks were resolved. Hope that helps.

 

I have an 08 5at with 57k that's starting to lag a bit when shifting too.

How many miles did you have when you changed the fluid? Did you change the filter also?

 

Not necessarily.

Not many ATs have drain plugs; on most you have to drop the pan, a good bit more involved than draining an oil pan.

AT filters don't just spin on, either.

Other than that, you are right...

 

Okay guys. I took the car to the mechanic and he drained the remaining of the oil and refilled it.
he told me there was a bit of carbon inside but the transmission is supposed to be okay.
I drived the car afterwards and although there is noticeable change the delay is still there.
what do you guys think ?

 

Was the mechanic familiar with working on Infinitis?

Is it possible you're imagining the delay? I'm willing to bet you're more than a little paranoid about it now. If it persists, take it to a dealership, it's possible you just need a software update though.

 

When you say delay do you mean that when you're shifting "manually" through gears, or when the car does it by itself? Are you driving in DS mode? If you are driving in DS, the car will hold gears out.

 

If it has transmission issue, it could get $.
Like others have suggested, ds is a different set of shift patterens.
IMO id do a full transmission service.
The only reason I'd have it done at the dealership is 2 fold.
First is they will check for shift linkage,shifter problems.
My shifter failed in the first 18 months of ownership.
Lucky for me, others here had help diagnose.
It would only mis shift when cold/again I had a bad shifter, wouldn't go into ds mode when cold.
Once it warmed up, you would never know a problem existed.
Good luck, just baby it until you get this sorted out.

 

To be honest the problem is not that major. But I feel its not right if you know what I mean.
When I say delay in shift I mean the automatic gear change and not on ds mode.
Another thing that I noticed but not sure if it's related.

When I am stopped and change from R to D and vise versa I notice a sound and a slight jerk.

 

Normal, happens to me too.

 

hey , question..what you did ? Change the shifter? Mine is jumping a little when is cold i think is on 3rd gear , after driving for 10 mins .. everything is good