keep your papers. go back to the dealer. if they send you home, go back again, keeping the papers. 6 times in 6 months, it's lemon law. hopefully you won't have to go that far. if it's known that quieter transmissions are out there, then you want one. it's a new vehicle with a factory warranty. don't touch it. don't add anything to it. don't mess with it or give them any reason to blame you. be nice to the dealer, let them know it's not their personal fault, but it is their responsibility to correct factory problems. Telling someone the gears are cut different... [censored]. plenty of sports cars out there with silent transmissions. be persistent, polite, but tenacious. you *might* use a paint marker and put a dot on a few bolts, trans casing, and take pictures. if they keep the car, tell you they did "x", look at the before and after to see... did they really replace it? remove it? drop the pan on it? if they say they took it out, but all of your marks still line up, take new photos then and there and then show them the old pictures and explain they have one chance to A) fix it, refund/trade it or B) you're taking the paperwork (saying they did something) and pictures (suggesting they did not) to an attorney. these are fun and practical vehicles. don't let the dealer ruin the experience for you.