2010 MAZDA CX9 Power Train Problems

I WAS DRIVING MY 2010 MAZDA CX9 WHEN A LOUD BANG HAPPENED. I WAS ON A SIDE ROAD AND STOPPED IMMEDIATELY, I COULD NOT VISIBLY SEE ANY ISSUES. I BEGAN TO DRIVE SLOWLY AND WITH EVERY ROTATION THE NOISE CONTINUED. LUCKILY I WAS NEXT A A GARAGE AND THEY DETERMINED IT WITH THE POWER TRANSFER UNIT (CASE). THEY HAD TOLD ME THIS IS A VERY COMMON ISSUE AND THAT MAZDA EVEN KNEW OF THIS ISSUE BUT NEVER HAD A RECALL PLACED. AFTER RESEARCHING AND SEEING MULTIPLE YEARS OF THIS ISSUE FOR THE CX 9 AND EVEN AN EXTENDED WARRANTY SOMETHING HAS TO GIVE MAZDA. BASICALLY THE FRONT TRANSFER CASE (OR POWER TRANSFER UNIT, PTU) IS TOO CLOSE TO THE EXHAUST SYSTEM AND GETS HEATED UP MORE THAN USUAL. THE GEAR LUBRICANT INSIDE GETS DETERIORATED A LOT FASTER AND BECOMES SLUDGE. IN THEORY GEAR LUBRICANT IN FRONT TRANSFER CASE、REAR DIFFERENTIAL、AND MANUAL...