If your G37 has a rough downshift between third & second gear. . .

[The Rever]

My car just received the newest software updates, part of which addresses a problem many owners have complained about. The downshift between third and second gears (at about 22mph) was very rough and jerky, which made coming to a stop smoothly quite difficult. I noticed it in my car all the time.

Having received my car back from the dealership just this morning, my initial impression is OUTSTANDING. It is now nearly impossible to detect! All vehicles now coming off the assembly line have this software, of course. If you don’t have it, get it the next time your car is in for service—at least if this is a problem in your car. I’m very pleased by it.

[Joey666Crack]

Was this the problem you were having with your car in your other thread?

[TommyC3]

I just picked up my G37X sedan last week and was noticing this very same thing. I thought there was something wrong with the transmission until I read your post. I'll have to look into getting the software update as the downshift can get annoying.