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Most Likely Culprit for Whine/Hum #5424656 05/09/20 10:39 AM
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The_Nuke Offline OP
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I’m trying to help my brother diagnose (via txt) a humming/whining noise his truck is making. We cannot agree on what the most likely culprit is, so I’m looking for some 2nd opinions.

Pertinent Info:

1) 2004 1 ton Dodge dually megacab longbed turbo Diesel with 321K miles on the clock.

2) automatic transmission was rebuilt within the last year or two.

3) carrier bearing and rear shaft’s u-joints replaced shortly after trans rebuild.

4) rear diff gear oil changed for the first time a couple days before this behavior began.

5) when speed is over 45 mph or so and the trans is in gear, there is a steady hum/whine from under vehicle.

6) letting off the gas does not deter the sound, but shifting into neutral does cause it to go away...until it’s put back into drive again, then it resumes.

He believes it is the carrier bearing, and I believe it is the rear-end. What do y’all think?


2012 Charger Pursuit aka "The Bacon Hauler"
- 5.7L + NAG1 (A5) + 3.07 (215mm)
Re: Most Likely Culprit for Whine/Hum [Re: The_Nuke] #5424676 05/09/20 11:15 AM
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andyd Offline
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The Diff was drained. Now there is a whine. Was Diff refilled? What with? over filled and foaming? I've screwed up enough times to know where to look when there is a problem with something I worked on grin2


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Most Likely Culprit for Whine/Hum [Re: The_Nuke] #5424682 05/09/20 11:28 AM
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Oildudeny Offline
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I'd start with the diff

Re: Most Likely Culprit for Whine/Hum [Re: The_Nuke] #5424687 05/09/20 11:37 AM
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MParr Offline
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Did you put the correct differential fluid in?
http://dodgeram.info/tech/BRSpecs/fluids/specs.html


2019 VW Tiguan SE 2.0 TSI Now: Castrol Pro OE LL IV 0W20 & OE VW
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Re: Most Likely Culprit for Whine/Hum [Re: The_Nuke] #5424688 05/09/20 11:40 AM
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The_Nuke Offline OP
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The gear oil drain and fill on the rear diff was done by a quicky lube place where he lives (Abilene), so whether or not the correct fluid was used is anyone’s guess.

I’d like to think they knew what they were doing and used the right stuff, and used the correct amount of it, but it’s definitely not a given that they did...


2012 Charger Pursuit aka "The Bacon Hauler"
- 5.7L + NAG1 (A5) + 3.07 (215mm)
Re: Most Likely Culprit for Whine/Hum [Re: The_Nuke] #5424695 05/09/20 11:59 AM
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RhondaHonda Offline
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I’d start with the diff. Drain and fill with correct amount of fluid.


2019 Ford Raptor
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Re: Most Likely Culprit for Whine/Hum [Re: The_Nuke] #5424715 05/09/20 12:39 PM
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sloinker Offline
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Only under acceleration above 45 mph? Sounds like a pinion bearing.


'16 Tiguan TSI Vaico 5W40
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Re: Most Likely Culprit for Whine/Hum [Re: sloinker] #5424720 05/09/20 12:47 PM
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The_Nuke Offline OP
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Originally Posted by sloinker
Only under acceleration above 45 mph? Sounds like a pinion bearing.

No, about 45 mph is when it gets loud enough to be heard, but it does not have to be accelerating.

Accelerating, you hear it,

let off the gas pedal, you still hear it,

shift into neutral, and it goes away,

shift back into drive (without hitting gas pedal) and it starts right back up


2012 Charger Pursuit aka "The Bacon Hauler"
- 5.7L + NAG1 (A5) + 3.07 (215mm)
Re: Most Likely Culprit for Whine/Hum [Re: sloinker] #5424721 05/09/20 12:47 PM
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mattd Offline
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Everything is still spinning in neutral, driveshaft /‘d rear end included. Carrier bearings will make noise as long as the truck is moving. Same for the rear end. A backlash or improper gear pattern will cause noise on acceleration.

It is worth inspecting the rear end but I think you have a bearing or gear set in the transmission that is causing your problem. Although the D+F on the differential and then you say it started is a little strange..

Last edited by mattd; 05/09/20 12:53 PM.

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Re: Most Likely Culprit for Whine/Hum [Re: The_Nuke] #5424760 05/09/20 01:58 PM
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4WD Offline
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Did they mention anything about the old oil looking pretty rough ?

Re: Most Likely Culprit for Whine/Hum [Re: 4WD] #5424781 05/09/20 02:22 PM
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The_Nuke Offline OP
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Originally Posted by 4WD
Did they mention anything about the old oil looking pretty rough ?


I can’t say, it’s my brother’s truck and he’s the one that had it done. It’s currently sitting on some ranch land while he finds a trailer to get it back home and have someone look at it. I’ve just been trying to remote diagnose a little so he’ll know what’s coming in terms of trouble/cost of repair.


2012 Charger Pursuit aka "The Bacon Hauler"
- 5.7L + NAG1 (A5) + 3.07 (215mm)
Re: Most Likely Culprit for Whine/Hum [Re: RhondaHonda] #5424956 05/09/20 06:21 PM
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Originally Posted by RhondaHonda
I’d start with the diff. Drain and fill with correct amount of fluid.


Yes .

Is it a limited slip diff ? If so , it needs a different type of gear lube .

Purchase a diff cover with a drain plug & a gasket . If it uses sealant , in stead of a gasket , use what ever MOPAR recommends . Do not over fill .

Look for leaks while you are at it .


Wyr
God bless
Re: Most Likely Culprit for Whine/Hum [Re: WyrTwister] #5425049 05/09/20 08:22 PM
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The_Nuke Offline OP
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Originally Posted by WyrTwister
Originally Posted by RhondaHonda
I’d start with the diff. Drain and fill with correct amount of fluid.


Yes .

Is it a limited slip diff ? If so , it needs a different type of gear lube .

Purchase a diff cover with a drain plug & a gasket . If it uses sealant , in stead of a gasket , use what ever MOPAR recommends . Do not over fill .

Look for leaks while you are at it .


I got my hands full with The Bacon Hauler’s preventative maintenance and periodic break/fixes. Anything that’s done to the Dodge truck in question will likely be done by some independent shop in Abilene...or another quicky lube shrug


2012 Charger Pursuit aka "The Bacon Hauler"
- 5.7L + NAG1 (A5) + 3.07 (215mm)
Re: Most Likely Culprit for Whine/Hum [Re: The_Nuke] #5425094 05/09/20 09:23 PM
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clinebarger Offline
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Turn O/D off & see if the whine is still present.


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2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Most Likely Culprit for Whine/Hum [Re: clinebarger] #5425097 05/09/20 09:30 PM
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The_Nuke Offline OP
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Originally Posted by clinebarger
Turn O/D off & see if the whine is still present.


I saw that procedure mentioned somewhere while I was doing some research on those trucks and driveline issues they have. What is the implication of the behavior changes/goes away with O/D turned off? Something to do with the transmission itself I’m assuming...


2012 Charger Pursuit aka "The Bacon Hauler"
- 5.7L + NAG1 (A5) + 3.07 (215mm)
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