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What can cause the off and on vibrations in front end of my 97 ford explorer sport only 70-80 mph?

* Unbalanced or bent wheels.

* Damaged or loose lug nuts.

* Worn-out or damaged ball joints: Check for play in the ball joints by grabbing the wheel at the 12 and 6 o'clock positions and wiggling it.

* Loose or damaged tie rod ends: Inspect the tie rod ends for play by grabbing the tie rod end and wiggling it back and forth.

* Worn-out or damaged control arm bushings.

* Improperly inflated tires: Make sure the tires are inflated to the correct pressure.

* Warped brake rotors: Check the brake rotors for warpage by spinning them while applying the brakes. If the rotors are warped, they will cause a pulsation in the steering wheel.

* Out-of-round tires.

* Driveline issues: Driveshaft, universal joints, and wheel bearings can all cause vibrations at certain speeds.

* Engine mounts or transmission mounts: are worn or broken.