Question about 2001 Ford F150 Styleside SuperCrew

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Rear drivetrain noise whine getting louder and louder

My truck drive train is getting louder - it sounds like differential whine its just getting louder and louder its very bad at 60 65mph it also at times it will modulate - go up and down when I am going steady speed. Is this serious? How do I fix it.

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  • Ford Master
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If it is the gears in the diff,it is pricey.
since most trucks get overloaded and this is the result,that is why the rule is 25% and lifespan is reduced by 50%
overload 50% and it is 200%

Posted on May 28, 2009

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Posted on Jan 02, 2017

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BMW whine noises 70mph


Hello Robert Anderson,

I always ask the color when my friends are describing their car... and immediately ask the interior color too...
It helps me imagine their following sumptuous description...
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but... for your car I imagine a noise.

Okay... a 70 mph whine usually means the rear end differential gears have gotten out of alignment.

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Check condition of rear differential oil.

Jack vehicle off the ground and run. Identify origin of noise.

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My 2002 Ford Explorer 4WD has a significant humming noise/light vibration while driving and sounds like the rear differential bearings/gears. How can I tell/pinpoint the problem?


Usually, the rear pinion bearing will make a higher pitched whining noise under a slight load. As soon as the throttle pedal is released, the noise stops. The rear axle shaft bearings will make a lower growling rumble when they are bad.

Another thing to check are the Emergency brakeshoes inside the hub of the rear rotors. The shoe material frequently separates from the rusty shoe plates and the bonded material gets pulverized. This would be similar to a "rocks crushing" sound and can cause vibration in the drivetrain.

The U-joints can cause this problem too. Check for rust and oil streaks which appear shortly before the U-joints fall apart. You should find telltale streaks on the undercarriage of your vehicle.
The front driveshaft can cause noise without being powered. There is just enough sympathetic rotation when the 4 wheel drive is Off, to cause sounds and vibration.

Testing can be aided by using a Commercial hoist and having the drivetrain engaged with the engine running. You would observe the shaking or use a probe "long broom handle" to the stationary parts like the axle tubes, differential housing, pinion bearing area, and so on. This would require a helper to sit in the hoisted vehicle and a second person to stand under a running machine. Not for the faint of heart. No baggy or loose fitting clothes, no long hair, etc.

Now there is a specialized machine which can Electronically investigate noise and vibration. There are sensors which are placed under the vehicle and it listens to vibrations. I saw one machine one time. It helps in balancing driveshafts too. A driveshaft balancing shop may be able to fix you up.

I hope my solutions are very helpful to you. If you do not have the exotic testing equipment you may have to drop the driveshafts to check your U-joints.

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Whine from rear differential when accelerating. the whine stops when I take my foot off the gas pedal.


when was the last time this was serviced.........as a replacement differential oil with additive MIGHT quieten this down.........however, this might be unlikely if the vehicle was not regularly serviced......if it only occurs whilst acceleratin this indicates wear on the main teeth...crown wheel/pinion......this COULD be an expensive repair....

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Have a loud whine from rear differential. gets louder with acceleration stops when not . replaced pinion bearing but still making noise. also the pinion has chewed into the gear housing somehow. how to fix


SOUNDS LIKE WORN BEARINGS OR IMPROPERLY SET UP UNIT. RECOMMEND TEARDOWN AND INSPECT ALL BEARINGS AND RACES . IF OK INSTALL NEW RING AND PINION ,,,,USE THE CORRECT SET UP TOOLS AND PROCEDURE!!!!!

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It sounds like you differential gear noise by your description.

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I have a whine in my drive train i think its in the rear end because when i take out of gear its still there i only hear when i'm coming to a stop what can i do?


take the backing plate off of the differential and use a magnet to check for metal. some fine metal dust is normal look for small pieces. inspect gears closely. get a gasket and gear lube before you start. check the universals on the drive shaft. i had a camaro once that had noise seemingly coming from the differential and it turned out to be the universal. noise from the suspension can be tricky to locate since the sound radiates throughout the chassis. you can raise the rear end and spin the wheels. have someone help. also check the brakes thoroughly

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1 Answer

Whining when accelerating


IT COULD ALSO BE A BAD U JOINT IF THE REAR HAD NO LUBE IT WOULD BE JUNK BY NOW

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