I have 97 f150 4x4 the only way i can get the 4x4 lever to pull in to 4x4 mode is to reverse the vac lines on the tranfercase help

SOURCE: 05 f150 4x4. 4 wheel drive lights come on but it is not engaged?

change actuator in front hub water gets in there freezez and ruber seal rips part only 120.00 bucks not hard to change beat upper ball joint take of spindle nut think it was 5/8 3 bolts in back should fall out

SOURCE: rear axle leaking

Block the front tires. Break the rear lugs loose. Jack up the rear of the truck at the center if possible. remove the wheels & brake drums. Remove the brake shoes,return springs & all the other hardware. Remove the differential cover & drain oil. If you have a posi the next step sucks. You need to remove the threaded pin from the housing & remove the axle retaining clips. All the while,being carefull of the spring in the posi unit. If no posi,then same procedure,minus the "pucker factor". After the axle is out,take a large flat blade screw driver or pry bar & pop the seal out. Keep in mind the axle bearing is probably gone too , so that's another procedure. Keep it apart,you'll be glad you did.

SOURCE: My 97 F250 wont shift out of park? Engine starts,

most likely your brake switch is out. If you had a scanner you would be able to see if the computer see's you pressing on the pedal. Or if you know how to test you could check to see if it switches ( completes the circuit ).

SOURCE: I have a 1997 F150 4X4. The front axle won't enage

I also have a 97 F-150 4x4. If that was my truck I first would change the fluid in the transfer case. See if that helps loosen it up. It is possible that it has the wrong fluid in it.

SOURCE: replaced gem module & transfer case motor

Did you check the vacuum solenoid ?

Also, should confirm, is this a ESOF ( electronic shift on the fly ) or MSOF ( manual ).

Could be a few other things, but best to test the easy one ( and mechanical out in the elements )