Rear end noise identification

[Melrose72]

Hi all. Need some help identifying this noise. Is this a rear wheel bearing? Is it the diff? Changes in pitch with speed and happens in gear and when the clutch is in.

[Son of Marty]

Not much video so it's hard to tell, from what little was there to me it sounds more gear box, but we need more with a lot more just driving (on the gas/off the gas type stuff) to even start to diagnose it.

[OldRoller]

Slightly off-topic, but I have used one of these for years to pinpoint sources of noise. Rattles, grinding, bearing roar, etc. Position the microphone clips, note placement, go for a ride. Recently found a rear panel weld popped causing a click on left turning that was annoying the mate and subsequently me 😵.

https://www.amazon.com/STEELMAN-06600-ChassisEAR-Electronic-Squeak/dp/B000IHIAES?th=1

[TobyB]

Hey, that's neat!

 

I've made similar things from parts I've 'borrowed' from work,

but it's always a cabbage of inverters, contact pickups, the like.

Now I know what to ask for for Christmas!

 

t

ps, if the noise changes when you load it up in turning, it's a wheel bearing.

If it stays constant, it's 'probably' not.

 

[tech71]

15 hours ago, ChuckTown72 said:

Need some help identifying this noise.

Hard to tell from available vid but are you referring to the clunk heard at 0:13?

First and easiest,

Check your exhaust system make sure its not banging around

[Melrose72]

the clunking is another issue! ignore the thunks from all the potholes.

its the winding wwwwrrring sound goes up and down in pitch based on speed. here is a longer version. can really be heard when coasting and in neutral.

 

 

 

 

 

[otisdog]

When was the last time you checked the oil in the diff?

[Melrose72]

Never. that has been suggested. ordered redline yesterday and hope its not a major project to tackle!

[Mike Self]

1 hour ago, ChuckTown72 said:

Never. that has been suggested. ordered redline yesterday and hope its not a major project to tackle!

Changing diff oil shouldn't be a major project, with one caveat....undo the fill plug before undoing the drain plug.  You'll feel mighty silly with a drained diff and a stuck fill plug!  And be sure to have the correct allen wrench to unscrew those two plugs...

 

mike

[Mikesmalaga72]

Perhaps closely inspect driveline? Rear diff cross member bushings. rear cross member mounts and rear floor tie bars, center driveshaft bearing/mounting and exhaust to shifter mountings/bushings for torques, fractures, tension free install and or misalignments? 

Edited October 9, 2023 by Mikesmalaga72
add

[Son of Marty]

Center bearing?

[Mikesmalaga72]

Like you said before.. hard to tell...so a full inspection is warranted if I heard that in my car. Who knows maybe a diff fluid change might be just all it needs.  Drive shaft center bearing to clarify. 

Edited October 9, 2023 by Mikesmalaga72

[OldRoller]

Definitely a bearing or gear interface whine. Quick and cheap locator - cut a piece of garden hose about 12 feet. Duct tape one end near the trans, throw the other end through the window. Drive and listen. Move the undercar end to near the diff. Drive again.

You should be able to locate the suspect component.

 

Fluid change may help, but to my ear it sounds like deeper investigation will be needed.