2000 ford f150 4x4 auto. my 4x4 will not engage i can shift it into 4lo but there is no power to the front wheel it sounds like it is locking in but no 4wheel drive. when i put in 4hi the kight on the dash does not come on. i have jacked the front end up while in 4x4 lo and i can spin the wheels by hand.

 

The transfer case may be shifting, but that shift thing-a-ma-bob on the front axle also has to shift into place. It's a vacuum actuated device on the front of the axle to the right of the hogs head, just about center of the axle. It has a protective plastic shield over it with two vacuum lines running to it. If you look under the cover you can see the actuation arm. With the truck running so you have vacuum, have someone switch in and out of 4WD while you watch to see if that thing is engaging. Just an idea.

 

Hogs head ? What's that doin in there lol.

 

ok i checked the thing-a-ma-bob and when i shift it does nothing but i squshed it together then i shifted it in to 4x4 lo and it worked. but i dont want to keep have to do that any advise.