Grinding noise between 25-40 mph

Tiny
IAMJOWENS
  • MEMBER
  • 1997 FORD EXPLORER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 170 MILES
Just recently bought a 97 ford explorer xlt 4.0l 4wheel drive. Just got 2 new tires and a transmission flush. Soon after started making noise (sounds like a grinding, though not constant and only after 10 or so miles, also slightly jumps) only between 25-40 mph. After 40 mph the noise ceases. Any suggestions?
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Tuesday, May 24th, 2011 AT 6:43 AM

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Tiny
CARADIODOC
  • EXPERT
Start with an inspection at a tire and alignment shop if they didn't do one already when they put the tires on. Noisy wheel bearings are becoming common on all brands of vehicles but typically once they start making noise, they do so all the time. They will sound like an airplane engine.

Ford has had more than their share of ball joint problems so those should be inspected very closely. They don't make grinding noises though; they might make an audible clunking noise but often you can't even hear them.

Another way to locate noises is with a "Chassis Ear". That is a set of six microphones, a switch box, and headphones. You clip the microphones to suspect points then drive while switching between the microphones and listening with the head phones. By moving the microphones around, you can zero in on the source of the noise. Be aware that many mechanics have never heard of or seen one of these tools. You might find one at an auto parts store that borrows or rents tools.

Sometimes the splash shield behind one of the front brake rotors gets bent and rubs on the rotor. The speeds you mentioned shouldn't be a factor but don't overlook them. They can be easily bent away from the rotor by hand.
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Tuesday, May 24th, 2011 AT 7:47 AM
Tiny
IAMJOWENS
  • MEMBER
Well. I can be stopes at a stoplight, shift to neutral and shut off an restart the motor, this seems to prevent the noise. Also. My rear tires are old enough to be more than an eighth of an inch smaller (due to wear) than my front.
Thanks for the reply.
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Tuesday, May 24th, 2011 AT 12:59 PM

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