I'm running a 2009 G37Xs with 192K on it. Lately, shifting down into 5th often takes 3 to 4 seconds and then shifts hard when it does engage. I'm wondering if this is time for a transmission flush/service or if I'm looking at other troubles? I've searched a bit on this, but not sure if those threads are related.
I'm not sure what TSBs have been done on this car, but since this started happening fairly recently and I've had the car since 92K, I'm thinking that's not an issue. Any info would help.

Thanks,

John

 

Trans should be changed 100k miles