I have a 2013 g37 Sedan. And currently having transmission problems(valve body). I had it fix before about a year ago. And now I’m having the same problem again, the car dosnt shift out of 3rd gear. Any know a where I can’t get a better valve body? Or do I have to get it from infinite again??

 

You could send it to a transmission shop like level10 to have them modify it for performance. It’d be cheaper than gettting a new one but still run about $1000. You’ll find plenty of remanufactured valve body’s for sale on google. But, it sounds like the car has gone into limp mode. While driving are you able to get the full rev range? Are you sure it’s the valve body/TCM itself and not a one of the various sensors inside the transmission? Throwing any codes?