My ford 1993 ford f250 front wheels wont engage. The light comes on when I shift into 4wd and I manually lock the hubs (they don't click though) and nada. Do I need the hubs replaced? What may be the issue?

SOURCE: 1994 chevy 1500 $ wheel drive wont engage

your problem is probably the front axle solenoid. it is in the center of the truck on the front axle and it is really easy to change. Simply unplug the electrical connector and use a wrench to loosen it. Spin it counter clockwise until it comes out........Manual hubs i believe are not available for this truck but i think there is a aftermarket cable you can buy and install to lock the front diff in.

SOURCE: Four wheel drive wont engage. Tranfer case is

Sounds like you either have a vaccum leak or your 4 wheel drive actuator is not working to engage the front differential.On my 98 ram there is a black and red plastic lines that are used for the vaccum lines. They are underneath and go from the transfer case to the front axle, check to see if one or both might be cracked or broke completely.If the lines are good then it could be your actuator on the front axle. A new one is about $93 at advance auto parts and not very hard to replace

SOURCE: front axle does not engage when I shift into 4wd

http://www.fixya.com/cars/t2084504-4wd_wont_work_1999_chevy_tracker_but

If you tracker doesn't require you to be in park or neutral when engaging 4 wheel drive then please try the link above.

Testimonial: "seems to be right on"