Why would it make whining noise at any speed over 25 MPH?

Tiny
BIGMAMAP
  • 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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Sunday, October 14th, 2012 AT 8:59 PM

15 Replies

Tiny
SATURNTECH9
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If you shift into neutral can you still here the noise?

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Sunday, October 14th, 2012 AT 9:10 PM
Tiny
KHLOW2008
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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.

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Sunday, October 14th, 2012 AT 9:10 PM
Tiny
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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?

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Monday, October 15th, 2012 AT 7:22 PM
Tiny
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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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Monday, October 15th, 2012 AT 7:26 PM
Tiny
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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?

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Tuesday, October 16th, 2012 AT 1:46 PM
Tiny
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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.

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Tuesday, October 16th, 2012 AT 5:40 PM
Tiny
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Thanks for that information. What type of oil do we use in the differential gear?

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Tuesday, October 16th, 2012 AT 5:49 PM
Tiny
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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?

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Tuesday, October 16th, 2012 AT 5:52 PM
Tiny
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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.

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Tuesday, October 16th, 2012 AT 6:29 PM
Tiny
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Rear differential appears to have leaked or lealing-How do we add oil and what kind?

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Tuesday, October 16th, 2012 AT 6:49 PM
Tiny
KHLOW2008
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Check the front of the differential, item # 27 in diagram. The link is generic and location sometimes differs.

LUBRICATION

Capacity is 5.5-5.8 pts. (2.6-2.7L) of Motorcraft SAE 75W140 High Performance Synthetic Rear Axle Lubricant (F1TZ-19580-B). If vehicle is equipped with Traction-Lok, add an additional 4 ozs. Of Friction Modifier (C8AZ-19B546-A). Capacities listed are approximate. Fill differential until fluid level is about 1/4" below bottom of filler plug hole.

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Tuesday, October 16th, 2012 AT 7:20 PM
Tiny
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There should be a side level fill hole level to fill and check the level.

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Tuesday, October 16th, 2012 AT 7:42 PM
Tiny
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Rear differential is leaking-can the leak be fixed or do we have to replace? How much does it take to replace it or fixit?

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Thursday, October 25th, 2012 AT 5:15 PM
Tiny
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Wheres it leaking from?

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Saturday, October 27th, 2012 AT 1:57 AM
Tiny
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Leaks are usually from sels and those can be replaced but if it is due to worn bearings, replacing the sels would not work. A rebuild is necessary.

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Saturday, October 27th, 2012 AT 5:00 PM

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