Diagram of front hub and axle 1994 Ford explorer 4 wheel drive.

Uneven tyres can cause wind up, jack one front wheel off the ground if it spins that is the fault, you should now be able to select 2 wheel drive, If not the fault is in the transfer case gear selector.

I think yours has the automatic locking hubs that slide over the the rotor hub. If this is the case than what has probably happened is a u-joint has gone bad and wiped out that auto hub.

Be prepared for some sticker shock on those hubs. they are not cheap. The usual fix for this is to replace the front axle ujoints and what ever hub is making the noise, hopefully just one.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Is it a 2 wheel drive of 4 wheel drive explorer?? I'm going to take a shot in the dark and go with 4x4. Remove the cotter pin and axle nut. Then jack up and brace the vehicle. Remove the front tire (since you said wheel bearing and not axle bearing), caliper, caliper bracket, and the three bolts on the back of the spindle that hold in the bearing and hub. Slide the hub and bearing out. May take a couple of taps with a hammer.

Before you start the vehicle lock the hubs in by turning the lock out device in the hub center of each front hub. Now you can start the vehicle and while in park or neutral move the range selector on the floor to the range you would like to use. Most often you will use the 4 wheel high setting. The low setting is only for extremely heavy pulling and will throw you across the seat if you accelerate too hard. Never exceed 45 miles per hour when in 4 wheel drive as you will burn out the transmission or 4X4 transfercase bearings. Now to go back to two wheel drive. Move the floor selecter back to 2 wheel drive setting. Do this with the vehicle in park or neutral to prevent damage to the vehicle. Now you can unlock the hubs by reversing the hub lock out device in the center of the two front hubs. Important little known fact is that you do not want to drive aroind with the hubs constantly locked in as you will lower your fuel mileage and cause extra wear to the axles and associated parts. Hope that helps, please come see us again if you have any more questions, Thanks, Rich.

there are 2, here's one.

Dana 44-IFS Front Drive Axle, Bronco and F-150 4x4 with Automatic Hub Locks

you should first check your hub assembly or wheel bearings if is a sunfire because i dont remember had worked on asunfire with 4 wheel drive or rear wheel drive they are front wheel drive and the axle shafts are in the front

Lary,
A possible problem is the cv axle. cv axles ar eknown for going out on those Explorers. Check them and contact me for further assintance.

I miss spoke...What had happen was that my front end was turning but hubs were not engaging...finally figured out automatic hubs were bad... when my ex had it she had a bearing repacking done, but they also put grease in hub.. wore down parts.. hope that helps..

Go to the engine compartment where the relays are located with the fuses. Check or replace the 4 wheel auto engage relay , maybe is not working. Is very clearly mark, I believe is the top right one looking at the bost front front of vehicle to the back. There is a diagram drawing of each relay in the cover, so you can't go wrong.

Year,4x4 or 4x2?