DUDE I HAVE CHANGED EVERY PART YOU CAN IMAGINE TRYING TO STOP THE GOD AWFUL NOISE I CONTINUE TO GET FROM THE FRONT OF MY 2005 MERCURY MOUNTAINEER PREMIER MODEL AWD, 4.6 V-8 ATOD. I EVEN CHANGED MY FRONT LEFT WHEEL BEARING, BUT I STILL HAD THIS TERRIBLE NOISE. BUT THE DAY I CHANGED OUT THAT FRONT WHEEL BEARING I GUESS GOD WAS TELLING ME, HEY "WADE' TAKE A REEEEALLY GOOD LOOK AT YOUR FRONT DRIVE SHAFT!! SO I LOOKED AT THE REAR RUBBER BOOT N THAT PART THAT BOLTS ONTO THE TRANSFER CASE AND DUDE IT LOOKE LIKE PURE HELL!! AND WE LIVE ON PROLLY THE WORST DIRT ROAD I OU COMMUNITY AJD WHEN IT RAINS IT GETS NOT JUST NASTY MUDDY, BUT SUPER SUPER NASTY MUDDY!!! ANYWAY WHILE I WAS CLOSE ENOUGH TO GRAB THAT FRONT DRIVESHAFT I DID AND GAVE IT A GOOD GO FUR.. AS MY OLE PAPPY NUSED TA SAY!!! AND BUDDY IT SHOOK LIKE JELLO!! THE SOUNDS I WAS GETTING FROM TAT ONE BAD REAR CV TYPE BEARING IN THAT RONT DRIVESHAFT SOUNDED LIKE SO MANY DIFFERENT THINGS IT COULD HAVE BEEN, LIKE AT FIRST IT SOUNDED LIKE BAD BRAKE PADS, THEN IT SOUNDED LIKE EVERY SINGLE BRAKE PAD ON ALL 4 WHEELS OR DISCS WERE ALL SCRUBBING AT THE SAME TIME. SO IM THINKING//OH NO MY TRANSFER CASE IS GOING BAD BUT THANKS TO MY DADDY GOD REST HIS BEAUTIFUL SOUL, I THANK HIM OH SO VERY MUCH FOR PASSING ON HIS KNOWLEDGE OF CARS TO ME BEGINNING WHEN I WAS JUST OLD ENOUGH TO TURN A DAMN WRENCH!! HE TAUGHT ME THE MANY MANY DIFFERENT SOUNDS A BEARING CAN AND WILL,MAKE AT THE SEVERAL DIFFERENT STAGES AT WHICH IT IS BREAKING DOWN MORE SND MORE. BUT THE ((((( ONE REALLY, AND I MEAN RESLLY NOTICABLE THING ))) ABOUT THIS NOT BEING MY TRANSFER CASE AND IT BEING MORE TOWARDS THE ((( FRONT DRIVE SHAFT ))) ITS SELF WAS THE FACT THAT EVEN THOUGH THIS THING SOUNDED AS IF IT WERE GONNA JUST FALL OUT AT ANY SECOND, IT WOULD JUST (( ALL OF A SUDDEN STOP )))) AND THE NOISE WOULD GO AWAY!! I STILL HAD THE VIBRATION IN THE CAR BUT WITH THE REAR BEARING GOING BAD IN THE FRONT DRIVE SHAFT IT HAD ****E ALL OUTTA BALANCE UNDER THERE.. MANY PEOPLE KEEP ARGUING BACK AND FOURTH ABOUT, CAN YOU OR CANT YOU REMOVE YOUR FRONT DRIVE SHAFT FROM THE MOUNTAINEER, AND THOSE WHO HAVE I WOULD SAY THAT AT LEAST 98TO 99% WHO SAY THAT THEY SUSPECTED IT WAS THEIR TRANSFER CASE AND THAT WHEN THEY REMOVED THE FRONT DRIVE SHAFT THE PROBLEM STOPPED!!!! WELL PEOPLE REMOVING YOUR DAMN FRONT DRIVE SHAFT ISNT GONNA STOP YOUR TRANSFER CASE FROM TURNING, BUT IT WILL STOP ALL THAT VIBRATION AND CLINKING AND CKANKING NOISE THAT YOU HAVE BEEN GETTING BECAUSE YOUR FRONT DRIVE SHAFT HAS BEEN THE REAL ,PROBLEM THE ENTIRE TIME!!!! AND I WOULD BE WILLING TO BET CHA ITS THE REAR CV BEARING GONE BAD BACK WHERE THAT RUBBER BOOT HAS MOST LIKELY DRY ROTTED AND ALLOWED DIRT MUD ROAD GRIME OR JUST WHAT EVER TO ENTER THE BEARING AND CAUSE IT TO PARDON MY LANGUAGE, BUT CAUSED THE REAR CV BEARING TO TAKE A ****E....IF YOU WILL!!! YOU CAN BUY A WHOLE NEW FROMT DRIVE SHAFT FOR LIKE ALMOST $400 OR JUST REPLACE THE BEARING AND BOOT ON THE BACK OF THE SHAFT FOR LIKE $90 OR $100 OR YOU CA GO TO THIS ONLINE WEBSITE CALLED ( PARTMYRIDE.COM ) AND FIND A WHOLE USED DRIVESHAFT OUT OF THE EXACT SAME SUV AS URS WITH LIKE 20 TO 80 THOUSAND MILES ON THEM!! WHICH I WHAT I DID!! SOLET ME GIVE ALL YOU GUYS AND GALS A BIT OF ADVICE....DONT AUTOMATICALLY ASSUME THAT UR TRANSFER CASE IS BAD OR YOUR TRANSMISSION IS GOING BAD..FIST CHECK THE FRONT DRIVE SHAFT AND INSPECT IT REALLY REALLY GOOD, THEN IF NEED BE, JACK EACH WHEEL UP JUST HIGH ENOUGH TO GRAB THE TOP AND BOTTOM OF EACH TIRE AND SEE IF YOU CAN SHAKE THE TIRE IN THE SLIGHTEST IF SO THEN YOU HAVE A WHEEL BEARING GOING BAD BUT IF YOU DO..PRAY ITS THE FRONT ONE THAT IS GOING BAD CAUSE THOSE REAR WHEEL BEARINGS ARE A REAL ***** TO REPAIR YOURSELF.. BUT FOR REAL EVEN IF YOU HAVE TO PHYSICALLY GET UNDER THE SUV AND REMOVE YOUR FRONT DRIVE SHAFT JUST LONG ENOUGH TO DRIVE IT AROPUND AND SEE IF THE NOISES AND ALL THE FUNKY **** STOPS WHILE THE FRONT DRIVE SHAFT IS OUT..YOU ARE NOTM GONNA HARM THE VEHICLE WITH THIS FRONT DRIVE SHAFT REMOVED, IN FACT YOU CAN ACTUALLY LEAE IT OUT UNTIL YOU HAVE THE OLD ONE EITHER REBUILT OR UNTIL YOU BUY A DECENT USED ONE OR EVEN BUY THAT $400 NEW ONE, WHICH I WOULD ADVISE AAINST CAUSE PART MY RIDE WILL SELL YOU A WHOLE FRONT DRIVE SHAFT FOR $50.00 PLUS $25.00 TO SHIP IT..YEAH, THATS $75.OO FOR A USED DRIVE SHAFT, BUT ITS STILL NOT $400.00 ****ING DOLLARS PEOPLE!! AND AGAIN THOSE OF YOU THAT HAVE SAID RIGHT HERE IN THIS FORUM THAT THE PROBLEM QUIT WHEN YOU REMOVED THE FRONT DRIVE SHAFT BUT YOU ARE STILL SAYING THAT YOUR TRANSFER CASE IS BAD, MY FRIENDS YOU ALL NEED TO SEEK PROFESSIONAL ADVICE!! BECAUSE IF YOU REMOVE YOUR FRONT DRIVE SHAFT AND THE PROBLEM WAS BASICALLY SOLVED THEN I WOULD HAVE TO SAY IT HAS BEEN YOUR FRONT DRIVE SHAFT THIS WHOLE TIME AND NOT YOUR TRANSFER CASE BECAUSE THE REMOVING OFF THE DRIVE SHAFT AINT GONNA STOP YOUR TRANSFER CASE FROM TURNING...USE YOUR NOGGINS FOLKS!!!! AND CHECK THAT FRONT DRIVE SHAFT FIRST EVERY TIME THEY ARE VERY VERY VERY AND I MEAN VERY VERY COMMON ISSUES WITH THESE BOTH 4X4 AND AWD EXPLORERE MOUNTAINEERS, EXCURSONS AND EXPEDITIONS AND EVEN LINCOLN NAVIGATORS CAUSE THEIR CHASSIS ARE ALL THE SAME ONLY THE BODIES THEY SIT N THEM AT THE FORD MOTOR COMPANY ARE DIFFERENT!! CHECK YOUR FRONT DRIVE SHAFT PEOPLE ESPECIALLY IF YOU OWN A FORD OR LICOLN MERCURY ALL WHEEL OR FOUR WHEEL DRIVE SUV THAT IS MAKING STRANGE SOUNDS ESPECAILLY WHEN YOU FIRST TAKE OFF UP UNTIL IT CHANGES INTO 3RD GEAR OR MANYBE EVEN OVERDRIVE!!