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What is this sound?
#686644 Sat Oct 16 2010 02:23 PM
Joined: Nov 2009
Posts: 674
twotone Offline OP
Shop Shark
My truck has a gear whine that bothers me. It's loud enough that you can hear it from a block away. It doesn't matter if it's running or not, in or out of gear, or clutch depressed or not, as long as the truck is moveing.
Have a listen, tell me what you think.

Re: What is this sound?
twotone #686648 Sat Oct 16 2010 02:49 PM
Joined: Nov 2006
Posts: 2,658
Shop Shark
I'd look towards a pinion bearing, its hard to tell but the noise does seem to change when the truck has a load put on the driveline.

Re: What is this sound?
don stocker #686669 Sat Oct 16 2010 04:15 PM
Joined: Nov 2009
Posts: 674
twotone Offline OP
Shop Shark
I thought pinion bearing noise got worse with a load on the drive train and quieter at a coast or deceleration, where as my truck does the opposite. I can change the tone and volume of the whine by moveing the shift lever back and forth as if trying to shift without useing the clutch, just before I force it out of gear the noise sometimes quiets or stops all together.

Re: What is this sound?
twotone #686676 Sat Oct 16 2010 04:46 PM
Joined: Sep 2006
Posts: 2,960
Shop Shark
I don't have enough experience to even guess at the noise, but from what you say about shifting would it make sense to drain the transmission, unhook the shifter links and pull the side case to look inside? At least you're not removing too much right away. Another thought is to raise the truck and run the engine and driveline to listen for the noise. But do it safely. Maybe you know of a shop that can put it on a chassis lift for you.

Re: What is this sound?
DrewP #686690 Sat Oct 16 2010 05:25 PM
Joined: Oct 2003
Posts: 447
Shop Shark
listened and I would look at the starter.the bendix.use a steathascope to listen too the spelling???? OR a long piece of end on your starter,the other to your ear.It,s only my guess.At first I was thinking the damper pully on the front of the engine.also listen to the generator

Last edited by dan-pa; Sat Oct 16 2010 05:48 PM.

Re: What is this sound?
dan-pa #686691 Sat Oct 16 2010 05:34 PM
Joined: Mar 2002
Posts: 9,010
Master Gabster
I would suggest using a piece of 3/8 hose to give you a very directional listening tool without getting too close. You could also run it with the rear on stands.

As far as draining the transmission or rearend fluid, you might find metal flakes coming out.

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Re: What is this sound?
truckernix #686707 Sat Oct 16 2010 06:47 PM
Joined: Oct 2009
Posts: 141
Wrench Fetcher
Sounds like an old truck. That said, mine sounds similar, I believe it's sound transmitted through the closed drivetrain from the pinion bearing, A good cleaning, and greasing may help, or R & R. drive

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Re: What is this sound?
Old Dollar #687131 Mon Oct 18 2010 06:45 AM
Joined: Mar 2007
Posts: 982
Shop Shark
It sounds to me like the pinion seal spring is off and rubbing on the shaft....should be able to duplicate running on jack stands...

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Re: What is this sound?
twotone #687155 Mon Oct 18 2010 11:49 AM
Joined: Feb 2004
Posts: 20,565
The ring & pinion gears are worn out. Start shopping for a replacement rear axle before it locks up entirely!

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Re: What is this sound?
Hotrod Lincoln #687421 Tue Oct 19 2010 02:17 PM
Joined: Nov 2009
Posts: 674
twotone Offline OP
Shop Shark
I'm not saying anyone is wrong, but, if it's the rear end, how can I change the sound or even stop the sound by moveing the shift lever around? If I have the truck in gear and I'm accelerating, I can pull the shift lever toward neutral and the sound sometimes stops completely until I let go of the shift lever or pull it out of gear or stop accelerating. Like I said, I'm not saying anyone is wrong, I'm just haveing trouble understanding how the shift lever is having any effect on rear end noise.

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