I think I broke it already

[moparedtn]

does the oil show signs of metal. rear bearing on tail shaft spinning inside the housing under load.
just guessing but under load and torqued up to road speed could be a binding bearing in the housing.

Thanks. That could very well wind up being the culprit. the noise is emanating from that part of the transmission.
If it winds up not the speedo cable, this will be the safe bet answer, in fact - which means this transmission is outta here if that's the case.

 

[65Fury440]

Yea mine sounded like the darn driveshaft. I felt like it was on the output side. Craziest thing, I didnt believe it till I seen it. New bearing type pilot in now, cleaned paint off the mating surfaces, all is good.

 

[65Fury440]

You did grab the front of the driveshaft and checked for play?

 

[Cornpatch MO]

Hmmm. Seems like someone said that early on in the thread.
Oh yeah - that was YOU.
(Sorry, don't have your flag handy. Canadian flag substituted.)

Seriously, if it was the pilot bushing, the noise would vary with engine (input shaft) speed I'd imagine.
It's not coming from the bellhousing area anyways.

Also, keep in mind that the input shaft does not turn in the pilot bearing when the clutch is engaged. ..............................MO

 

[kiwigtx]

Also, keep in mind that the input shaft does not turn in the pilot bearing when the clutch is engaged. ..............................MO

Does the pinion gear (input shaft) really stop dead at 5,000 RPM when you simply depress the clutch pedal at speed?

 

[Cornpatch MO]

Does the pinion gear (input shaft) really stop dead at 5,000 RPM when you simply depress the clutch pedal at speed?

The clutch disc is on the input shaft splines . when the clutch is engaged ( pedal up) the pressure plate ( clutch) clamps the clutch disc to the flywheel which is bolted to the crankshaft, which has the pilot bearing in it. So, all these parts are bolted and clamped together, making them all spin at the same RPM as the engine. When the clutch is dis engaged( pedal to the floor), that un-clamps the clutch disc and allows the input shaft to spin , in the pilot bearing, at a different speed than the crankshaft. If the clutch was dis-engaged, and the transmission was in neutral , in theory, the trans input shaft could be stopped from turning with the engine running.........MO

 

[moparedtn]

Yea mine sounded like the darn driveshaft. I felt like it was on the output side. Craziest thing, I didnt believe it till I seen it. New bearing type pilot in now, cleaned paint off the mating surfaces, all is good.

Did you use one of these?
https://www.ebay.com/itm/Mopar-PILO...ash=item33e277be90:g:qTsAAOSwo3pWdGjo&vxp=mtr

 

[moparedtn]

You did grab the front of the driveshaft and checked for play?

Yessir. In fact, all of that was addressed back last fall when I was experiencing a highway speed harmonic vibration. Found the tailshaft bushing was worn and replaced it; I have a thread on that here somewhere.
In fact, about everything I've gone through in this car in its' resurrection is chronicled here somewhere.

 

[moparedtn]

Also, keep in mind that the input shaft does not turn in the pilot bearing when the clutch is engaged. ..............................MO

You know it. The clutch/input area was the first thing I suspected when this happened, figuring I had lost my mind and blew something up in the bellhousing.
Nope, the noise is neither affected by engine speed nor whether in gear/out of gear or clutch in/clutch out.

 

[Cornpatch MO]

Did you use one of these?
https://www.ebay.com/itm/Mopar-PILO...ash=item33e277be90:g:qTsAAOSwo3pWdGjo&vxp=mtr

That bearing is also available with a sintered bronze bushing rather than the needle bearings. Both available from your local parts store. or Mopar parts. They are for a Dodge mid sized pickup with a A833 overdrive manual transmission. Possibly for a full size pickup with manual transmission........................MO

 

[Cornpatch MO]

You know it. The clutch/input area was the first thing I suspected when this happened, figuring I had lost my mind and blew something up in the bellhousing.
Nope, the noise is neither affected by engine speed nor whether in gear/out of gear or clutch in/clutch out.

Oh, so out of gear too. That may be an important clue to some one who understands all about an A833. Maybe a call to Breweres with a link so they can hear the sound?.....................................MO

 

[moparedtn]

UPDATE (and it ain't any better):
New video up:

Apologies for the lousy camera work, but I don't have any fancy brackets or stands, just my phone.
You get the gist of it - in fact, in this video, you see how randomly the noise just starts up.
Once it has done it though, it can reliably be made to do it over and over above 45mph, 3rd or 4th gear,
throttle on or off, clutch in or out, out of gear even.

One new piece of evidence to report, though...
I decided today to take it on up in speed and see what happens - and the noise fades away around 70mph.
Interesting.
Anyways, it's gotta come out unless someone on here can pinpoint the issue with some degree of certainty.

Do you ever wonder if you just weren't meant to have something?
Damn, this thing has been a dogfight for a long time now. Thought it was over.
Nope.

 

[dave dodge]

Thanks for the update Ed, was hoping it was just the Speedo cable. You just can't catch a break! But as always you will Win!

 

[mopar 3 B]

Pull the driveshaft. Insert a plug to keep the fluid in and try again. A plug over the tail shaft should also work. If the noise appears you will now where its at. If not well time to dig into the rear.,

 

[moparedtn]

Pull the driveshaft. Insert a plug to keep the fluid in and try again. A plug over the tail shaft should also work. If the noise appears you will now where its at. If not well time to dig into the rear.,

Is there a cap/plug available that would let me do that (spin the thing up to speed)?

 

[PP1RT]

I still think it sounds like a bad bearing/worn shaft vibrating. Unless there is a balance issue with the driveshaft resonating up thru the trans?

 

[eldubb440]

not to minimize the situation..........but compared to all you have done, this is a minor setback

also, and I guess this is a question for 3B; what if it is in the trans, but only makes the noise under the load of spinning the rear?..... what about a stethoscope while everything thing is spinning as a unit? could it be as simple as a worn yoke on the front of the drive shaft?

 

[moparedtn]

It's just weird that it "turns on" like it does the first time (like in the video), like someone flicks a switch?
But boy, once whatever it is gets warm enough, it does it every freaking time I get over 45mph without fail.

When everything is cold, whatever is the problem starts out in place, where it's supposed to be - no noise.
Then once things get a few miles on them and speed gets above 45, *flick* goes the switch and there's the racket.
Only thing that affects it is dropping below 40mph or apparently getting up towards 70mph.
NOTHING else affects it.

 

[mopar 3 B]

Is there a cap/plug available that would let me do that (spin the thing up to speed)?

Moroso 41060.
A piece of 1 1/2" od thin wall pipe with a plug in it should work. The seal should hold it in place.
For no longer than you will be running it if the seal extends beyond the shaft just tape it off.

 

[BDF6]

Good luck with this, I'm rooting for you moparedtn!