Hi:
Check for a loose exhaust, cracked coil spring (front) leaf spring (rear). Also, two more things. The Explorer has a reputation for having shackles rust out and break. A shackle is the steel item that holds the leaf spring (rear) to the frame. Most common is they rust apart in the rear. If you can jack the car up from the frame (not the axle) you will be able to see if they are broken because the axle will hang lower on one side and the leaf spring will move away from the frame / mount. Also, try the bounce test to see if the shocks are still good. Bounce the front from the bumper. If it stops within 3 bounces, they are ok. If it takes more to stop, the shocks are bad. Do the same from the rear the check the back.
Let me know what you find. Also, if you find that it is a shackle, don't drive it until it is repaired.
Let me know.
Joe
Wednesday, March 25th, 2009 AT 8:45 PM