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#2459547 - 03/01/18 04:18 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: ]
Grizzly Offline
master

Registered: 08/24/05
Posts: 4900
Loc: at work
Easy/cheap stuff first:

I'd take a close look at the rear transmission mount. twocents

Next would be a u-joint, but I can't say I've ever heard one make that kind of noise. Won't hurt to re-check them.

Great video: that helps alot. up

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#2459552 - 03/01/18 04:34 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: ]
71GTX471 Offline
pro stock

Registered: 01/28/03
Posts: 1304
Loc: Harriman NY
Could it be the steel starter shield buzzing if equipped.

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#2459559 - 03/01/18 04:46 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: ]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 30798
Loc: Bend,OR USA
It sounds just like someone or something blowing on a piece of paper or thin plastic making a whistle like noise like we use to do when I was a kid, a long time ago shruggy


Edited by Cab_Burge (03/01/18 09:07 PM)
_________________________
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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#2459573 - 03/01/18 05:26 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: Cuda340]
71birdJ68 Offline
master

Registered: 02/09/12
Posts: 3839
Loc: Morristown Tn.
That's what I was wondering, cause the manual doesn't say anything about lash.

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#2459641 - 03/01/18 08:13 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: 6PakBee]
moparedtn
Unregistered


Originally Posted By 6PakBee
Okay, if I've got this right.

1) Noise is dependent on road speed, not engine speed.
2) Noise is present in neutral with enough road speed.
3) Noise is present with clutch depressed and enough road speed.

If the noise is present in neutral with the clutch depressed and enough road speed, the only thing that is rotating is the output shaft. I think the rear main bearing is a good guess.

Yes, along with anything beyond or driven by the tail shaft, such as the speedo pinion and such.
The bearing is certainly a suspect, even though the noise doesn't sound like a bearing.

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#2459711 - 03/01/18 09:49 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: 71birdJ68]
moparedtn
Unregistered


Originally Posted By 71birdJ68
What are you mean when you say the lash is correct on the pinion adaptor?

Referring to the speedometer pinion adapter there.
the lash is darn close because the speedo works perfectly and there is zero discernable wear on the speedometer pinion.

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#2459712 - 03/01/18 09:50 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: Cuda340]
moparedtn
Unregistered


Originally Posted By Cuda340
It could also be the rear bushing in the tailshaft, where the slip yoke rides... Pull out the slip yoke and see what the machined surface looks like.

That bushing (and the seal) were replaced last fall with Brewers stuff. Oil hole was even clocked correctly on it.

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#2459715 - 03/01/18 09:54 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: Cuda340]
moparedtn
Unregistered


Originally Posted By Cuda340
Originally Posted By 71birdJ68
What are you mean when you say the lash is correct on the pinion adaptor?


There are three different settings for the speedo adapter depending what tooth the speedo gear is. I think that is what he was referring to .

Yessir! :-)

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#2459718 - 03/01/18 09:57 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: Grizzly]
moparedtn
Unregistered


Originally Posted By Grizzly
Easy/cheap stuff first:

I'd take a close look at the rear transmission mount. twocents

Next would be a u-joint, but I can't say I've ever heard one make that kind of noise. Won't hurt to re-check them.

Great video: that helps alot. up

Thanks. As far as the mount goes, it's also brand new from Brewer's, as is the crossmember. Since the transmission is an early 70's dual shifter mount type, I had to get one of Dan Brewer's crossmembers that has the late 60's bolt holes but the early 70's mount. Kind of a hybrid.
Worked beautifully.
Yep on the u-joints. I reckon I'll replace those just because I don't know how old they are now, even though as you say it doesn't sound like one. No real discernable slop in them, though.
I'll replace the slip yoke too just because.

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#2459724 - 03/01/18 10:06 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: 71GTX471]
moparedtn
Unregistered


Originally Posted By 71GTX471
Could it be the steel starter shield buzzing if equipped.

Well, that's the other end of the spectrum (and other end of the transmission, of course) but I can't say definitely not, either.
Stranger things have happened.
I think the key to this mystery is what I was doing to the car when this occurred.
I pulled away easy from a stop sign, then tromped on it once underway. A fast grab of 2nd, dropped the clutch pretty hard and laid down two black strips, then heard the noise as I eased back off the throttle.
It's been there ever since, even though the car drives just fine.
I get it up over 50 and the "switch" gets flipped and the racket begins, every time.

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#2459725 - 03/01/18 10:07 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: ]
71birdJ68 Offline
master

Registered: 02/09/12
Posts: 3839
Loc: Morristown Tn.
How would you feel about putting the car on jack stands and trying to pin point the noise while in gear? I mean the rear end on the stands and running it up till it does it? Maybe putting phone on a stick on record, and move it around till you found where it was coming from.


Edited by 71birdJ68 (03/01/18 10:09 PM)

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#2459726 - 03/01/18 10:08 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: Cab_Burge]
moparedtn
Unregistered


Originally Posted By Cab_Burge
It sounds just like someone or something blowing on a piece of paper or thin plastic making a whistle like noise like we use to do when I was a kid, a long time ago shruggy

Ah yes. the reed effect. We used blades of grass to do that. :-)

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#2459728 - 03/01/18 10:11 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: 71birdJ68]
moparedtn
Unregistered


Originally Posted By 71birdJ68
How would you feel about putting the car on jack stands and trying to pin point the noise while in gear? I mean the rear end on the stands and running it up till it does it?

I'm glad you asked that. :-)
We did just that last weekend. Put the rear end up on 4 jackstands, then cautiously ran it up through the gears. I was "driving" (and praying not to go flying through the wall into the house) while a friend was outside, down on the floor watching and listening.
I ran the car all the way up to an indicated 70mph. Could not get it to make the noise.
It occurred to me later that the noise starts after the car has been driven about 5 miles, so I guess something has to get warmed up before it will make the noise - and we didn't do that while the car was on jackstands.
Oy.

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#2459733 - 03/01/18 10:15 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: ]
amxautox Offline
Still Retired. Still Posting on Moparts. A Lot.

Registered: 05/13/03
Posts: 96591
Loc: On The Boat, On The Lake, Wa. ...
Warm it up for 6 miles. Then 'drive' it on the jack stands.

Use a LONG steel rod to listen to different parts/areas of the trans to narrow down the spot. A long rod like a dowel or even a floor jack handle. Hold it to your ear like an automotive stethoscope.

Maybe a bearing is coming apart.
_________________________
Tom

"Everyone should believe in something; I believe I'll go fishing."

-Henry David Thoreau

Men and fish are alike. They both get into trouble when they open their mouths

author unknown


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#2460020 - 03/02/18 03:12 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: ]
RATTRAP Offline
pro stock

Registered: 03/28/05
Posts: 1386
Loc: N/E, Michigan
Possible Pilot bearing?

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#2460079 - 03/02/18 05:01 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: RATTRAP]
moparedtn
Unregistered


Originally Posted By RATTRAP
Possible Pilot bearing?

I would imagine if it was that, it would change in pitch with engine speed?
Thanks!

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#2460085 - 03/02/18 05:06 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: amxautox]
moparedtn
Unregistered


Originally Posted By amxautox
Warm it up for 6 miles. Then 'drive' it on the jack stands.
Use a LONG steel rod to listen to different parts/areas of the trans to narrow down the spot. A long rod like a dowel or even a floor jack handle. Hold it to your ear like an automotive stethoscope.
Maybe a bearing is coming apart.

Could very well be the rear main bearing, although it doesn't sound like a bearing at least to me.
I might deploy your steel rod method of detection, but I think I'd rather take the shifter boot off and "probe" through that hole with a smaller rod.
The thought of anyone getting under the car with anything while it is in gear and hauling just doesn't sit well with me.

I've just picked up a Moroso transmission "plug" (pipe stub with plastic cap on the end) that I'm told will fit in the output seal in lieu of the slip yoke. I might try to see if I can dry run the thing in the garage with that.
Perhaps eliminating the driveshaft/yoke from the process might prove illuminating?

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#2460104 - 03/02/18 05:25 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: ]
amxautox Offline
Still Retired. Still Posting on Moparts. A Lot.

Registered: 05/13/03
Posts: 96591
Loc: On The Boat, On The Lake, Wa. ...
Originally Posted By moparedtn
Originally Posted By amxautox
Warm it up for 6 miles. Then 'drive' it on the jack stands.
Use a LONG steel rod to listen to different parts/areas of the trans to narrow down the spot. A long rod like a dowel or even a floor jack handle. Hold it to your ear like an automotive stethoscope.
Maybe a bearing is coming apart.

Could very well be the rear main bearing, although it doesn't sound like a bearing at least to me.
I might deploy your steel rod method of detection, but I think I'd rather take the shifter boot off and "probe" through that hole with a smaller rod.
The thought of anyone getting under the car with anything while it is in gear and hauling just doesn't sit well with me.

Yes, that is why the LONG ROD, or steel handle from the floor jack, keeps the person out from under the car.

I've just picked up a Moroso transmission "plug" (pipe stub with plastic cap on the end) that I'm told will fit in the output seal in lieu of the slip yoke. I might try to see if I can dry run the thing in the garage with that.
Perhaps eliminating the driveshaft/yoke from the process might prove illuminating?
_________________________
Tom

"Everyone should believe in something; I believe I'll go fishing."

-Henry David Thoreau

Men and fish are alike. They both get into trouble when they open their mouths

author unknown


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#2460150 - 03/02/18 06:11 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: RATTRAP]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 30798
Loc: Bend,OR USA
Originally Posted By RATTRAP
Possible Pilot bearing?

I would think he has a pilot bushing, not a bearing work
OP, is it a bearing or bushing?
_________________________
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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#2460154 - 03/02/18 06:13 PM Re: Can anyone confidently identify this noise? A833 4 speed [Re: ]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 30798
Loc: Bend,OR USA

Could very well be the rear main bearing, although it doesn't sound like a bearing at least to me.
[/quote] iagree No way a main bearing failing lives that long, trust me on that shruggy
_________________________
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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