Replaced right front wheel bearing on my 2003 ford explorer 4x4 and when i drive it it seems like it is rocking or shaking do you know what the problem might be I did buy the wheel bearing at a junk yard

4x4 ? how many miles ? jack front wheels off ground and rotate by hand feel for the grind, bad wheel hub bearing? check brake rotor dust shields, If high miles possibly front carrier or pinion bearing. Just replaced front , rear , and transfercase bearings on my 98 with 193,000 mi. And yes,they were all bad $500.00 did labor myself. did rear first as it was humming, week later grind and hum coming from front, then couple days later transfer case was also whinning,humming, good god what a project all that was but today its great and quiet.

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.

You may have a bad wheel bearing--do you hear a growing noise that gets louder with speed? The wheel sensors on your wheels are sensitive to excess motion between the wheel hub and the wheel, as they have a small gap between the sensor and the tone ring on the axle. The speed sonsors are used by both the ABS and the traction control systems on your truck. You can check your bearings for failure by jacking up the car and trying to shake the wheel. If the wheel doesn't have noticeable play, the bearing may still be bad enough to cause the sensor to misread the speed. If you're not sure, have your mechanic check the wheel bearings. If you have more questions, please let us know.

If the noise is only when the vehicle is moving it sounds lek you have a bad wheel bearing. You can inspect ford move ment or play shaking the tires up and down and left to right while lifted up on hoist or jack. If there is no movement doesn't necesarily mean the bearings are okay, however if there is movement in bearing replace and drive again. Antoher way to determine Which wheel bearing is bad is to drive and turn to the left, if the noise gets louder than it mens the rightside wheel bearung is bad. If you turn to the right and noise gets louder replace driver side front wheel bearing. Also Rub your hands across your tires, does it feel wavy or uneven, you could have cupped tires, I DON'T KNOW HOW NEW THEY are but cupped tires will also make this noise. One way to see if it is the tires is to do a rotate If noise changes at all then you no its a tire causing noise. Hope this helps.

its the right front wheel bearing i had this problem about a month ago

does the shake come and go at different speeds? check your tie rod ends by lifting the front wheels off the ground and grab the tire and shake from left to right. if they are tight you probbably need to replace the rotors

is it front or rear wheel drive¿¿

check u-joints

Wheel bearings is my guess. Confirm this by jacking the vehicle up with wheels on and check for play. Grab the tire by the top and bottom and wiggle it in and out, the will be excessive play. Given the fact that you gave a clear explination i am almost certain its bearings. You will need to purchace new bearings(Inner and Outer), Hub Seals, and possibly a possibly an axle seal kit for the 4x4 drive axle (they get old and stick to the axle durring disassembly) and keep in mind that to get the outter races of both bearings in the hub need to be "Pressed" out a a machine shop, or by any shop that might have a press.

not press fitted, standard tapered bearings, if 4X4 it is a little more involved, just dont misplace any of the smaller parts and you will be fine.