Mechanics

WHY WOULD IT MAKE WHINING NOISE AT ANY SPEED OVER 25 MPH?

2001 Ford F-150 • 164,000 miles

As we accelerate to speeds over 25 the truck begins to whine and continues until we slow down.
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Bigmamap
October 14, 2012.



If you shift into neutral can you still here the noise?

Saturntech9
Oct 14, 2012.
It would depend ono where the noise is coming from ans since it is speed related, I would start with checking the various differentials. They could be out of gear oil.

Other possibilities would be wheel bearings.

KHLow2008
Oct 14, 2012.
It only makes the noise at speeds over 25 so can't shift to neutral while driving.

How do we check various differentials to add gear oil?

How do er check wheel bearings?

Tiny
Bigmamap
Oct 15, 2012.
Why can't you shift into neutral while driving?I have done that many times on many different vechiles for diagnosing problems.
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Saturntech9
Oct 15, 2012.
Will try next time out. What about the other questions?

How do we check various differentials to add gear oil?

How do we check wheel bearings?

Tiny
Bigmamap
Oct 16, 2012.
http://www.2carpros.com/articles/checking-fluid-levels

Above link has information on how to check differential oil level.

For checking wheel bearings, lift up wheels and check for excessive side play by shaking the wheel lightly. Turn the wheel manually and note if any noise ie emitted. Light noise would be hard to detect if you do not have any experience with it.

KHLow2008
Oct 16, 2012.
Thanks for that information. What type of oil do we use in the differential gear?

Tiny
Bigmamap
Oct 16, 2012.
There appears to be no port on the differential as shown in the picture from the link given. It does appear to have leaked or to be leaking. Now what?

Tiny
Bigmamap
Oct 16, 2012.
So are you talking about the front differential or rear differential?Also you can put a hand on the coil spring while turning the wheel to feel for a bad wheel bearing.

Saturntech9
Oct 16, 2012.
Rear differential appears to have leaked or lealing-How do we add oil and what kind?

Tiny
Bigmamap
Oct 16, 2012.
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