There should be a jack in the compartment behind the back seat.
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I goes under the passenger side back seat.
On a 2001 Ford Explorer Sport Trac it's in the passenger side rear cab compartment behind the access door in the trim panel ( according to the Owner Guide )
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On a 1999 Ford Explorer ( using the factory jack ) Front tire ( there are " hooks " on the front of the lower control arms ) Rear tire ( under the axle tube , below the leaf spring )
If you have your manual it will show not to change tire size as it changes the stability of the vehicle
The tire jack is supposed to be under the carpeted lid in the floor of the cargo area along with a bag including the tools on a 2008 Ford Explorer
On your 1996 Ford Explorer : Open the drivers door , and on the end of the door you will see an information sticker . It will show the original size of tire on the vehicle from the factory
On a 2001 Ford Explorer Sport : Open the drivers door and you will see an information sticker that shows the original size of tire on the vehicle from the factory ( the sticker is on the latch pillar )
On Ford vans it is in the rear in the compartment that holds the jack and tire iron. you might check there. its located passenger front floor board just above the carpet
On a 2000 Ford Explorer : Using the factory jack : Front tire ( there are hooks / bars on the fronts of the lower control arms ) Rear tire ( under the axle tube below the leaf spring )
On a 2003 Ford Explorer Sport : Open the drivers door and on the latch pillar you will see an information sticker . One of the things the sticker shows is the original size of tires on the vehicle from the factory