Frt lock out hubs inop

check the vac. hoses

just unbolt it and remove be sure it is jackedup to install

just unlock the front hubs, if the transfer case is out the only thing involved is the two front locking hubs

take off the fender bolts and the wheel well bolts take out headlight bolts behind the headlight then it should come off

Remove the cover of the frontend and inspect it for any signs of damage.

If it is a 2 wheel drive, it is probably your wheel bearings. If it a four wheel drive, it could be the front differential, the joints on the axle shafts, the locking hubs, or the wheel bearings. On the four wheel drive, crawl under the vehicle and grab the axle shafts and see where the excess movement is. Also try grabbing the tires and see if there is any movement. There shouldn't be any movement while the wheels are on the ground.

Hey, I also have a 90 F-250, manual locking hubs. My repair manual says to 'be sure to apply a light coat of high temp. wheel bearing grease to the splines of the axleshaft and the components of the locking hub.'

what is the problem with your 4x4 ?

you will need u-joints,frt hub seals,axle shaft dust seals and hub o-rings.most ford dealers charge 3 hrs for the hub service(seals) and 1.5 hrs to replace L+R u-joints.if they try to charge any more than 4.5 hrs go to different shop.if DIY there is a special seal driver needed to complete this repair.

replace your auto/lock hubs with WARN manual lock hubs,this will save you hunderds.as long as you dont mind having to get out to lock in. NAPA.