I have a four speed manual four wheel drive.

FRONT WHEELS IN THE AIR

HOLD ONE STILL----TURN THE OTHER

DOES THE FRONT DRIVE SHAFT TURN?

NO TURN. BROKE HUB. BROKE AXLE

DRIVE SHAFT DOES TURNTRANSFER CASE PROBLEM

THE MEDIC

OK MUSIC GAL!

THE TRANSFER CASE IS WELL.........

YOUR ENGINE IS CONNECTED TO THE TRANSMISSIONTRANNY CHANGES THE GEARS SO THAT YOUR ENGINE CAN "HANDLE" THE LOAD FROM STARTING FROM "0"MPH TO HOWEVER FAST YOU GO!

2 WD AND 4 WD VEHICLES HAVE THIS

4 WD VEHICLES HAVE SORTA ANOTHER TRANSMISSION SORTA DEVICE---IT CONNECTS TO THE REAR OF THE TRANNYIT'S JOB IS TO RUN EITHER THE 2WD OR 4WD SELECTION YOU MAKE IN THE COCKPIT

YOURS MAY BE TORE UP TERRIBLY (LET'S HOPE NOT!)

HAVE YOU CHECKED THE FLUIDS IN THE ENGINE/TRANSMISSION/ TRANSFER CASE/ FRONT DIFFERENTIAL/ REAR DIFFERENTIAL?????

NEED MORE INFO?.........ONE OF THESE WOULD BE YOUR BET FRIEND.....SEE "MY ANSWER" IN HERE

https://www.2carpros.com/questions/2007-ford-taurus-tune-up

I HAVE 2 JEEPS---GONNA SHOW YOU WHAT I USE TO FILL MY DRIVE TRAIN ITEMS (NOT THE ENGINE) I'LL SHOW YOU SOME PICS OF BOTH OF MY (MANUAL) TRANSMISSIONS AND TRANSFER CASESI'VE HAD BOTH SETS OUT FOR MAINTENANCE AND REPAIRS RECENTLY

YOURS MAY BE SIMILAR (OR NOT)---YOU MAY HAVE AN AUTOMATIC TRANNYYOU MAY ALSO HAVE "MOTORIZED" STUFF THAT SHIFTS YOUR TRANSFER CASE IN AND OUT OF 4WD (WHICH COULD ALSO BE YOUR PROBLEM)MY STUFF IS ALL MANUAL (WHEN I SHIFT THE TRANSFER CASE IT'S ALL IN MY HAND AND ARM!)

YOU WILL NEED TO KNOW EXACTLY WHAT TYPE OF FLUID GOES INTO EACH PARTFIND THE "FILL PLUG" TOO

YOUR TURN

THE MEDIC