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Driveshaft with massive flange at yoke/trans end?

funknut

funknut

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Any idea what this massive flange would be for? It's so big it wouldn't fit through the driveshaft hoop.

I am replacing the floor so it was easier to cut it out than try and unbolt it.

IMG_2133 (2).jpg
 
What kind of car, truck, van, motorhome, SUV or Quad is that from?
 
The 66’ Belvedere that I swapped a 6.1 into had a drive shaft like that one pictured. It was originally a 318/727/8 3/4, and it was ditched! Not too sure why the factory did that, but I’d toss it and get a minimum 3 inch drive shaft made.
 
It is called an inertia ring by the factory, and several mdels of car got them. My 67 coronet has one. It certainly makes the driveshaft heavy. It does no real world good as far as I can see.
 
Thanks everyone. I will ditch it for sure. And yes, it’s obnoxiously heavy!
 
My 67 Coronet R/T has one. The drive shaft company that I took it to for them to check the balance found no issues with it so I am going to keep it.
Also had a 67 Coronet R/T parts car that I used the complete rear end and drive shaft for a 67 GTX. It runs and drives great, no vibration or driveline issues. It's smooth as silk.
I have never seen these on a Belvedere or GTX. I'm not saying they didn't, but I have no problem in using them.
 
funknut said:
It was on my 68 Charger. Original 383/727 car. No idea if this is the original driveshaft, though.
Click to expand...

I had a 68 Charger parts car.. with a 383/auto years ago, and it had a driveshaft exactly as shown, and I believe it was a factory unit. I am pretty sure it was used for calming driveline harmonic's down.
 
Friend had 68 charger replaced the original driveshaft that had the enertia ring with one that did not. He always had a rump rump rump rotating sound at highway speeds. My 67 has original drive ahaft with that ring also no odd sounds
Like he had. Not sure if that was his problem but it was something he changed.
 
I had the same driveshaft on the '70 Road Runner that I had back in the '90's. That car would sing at high speed....no vibration at all....even at 150mph. :D


:xscuseless:


upload_2019-8-5_10-2-4.png
 
Chrysler went to a tail shaft weight. I should have kept it instead of throwing it away.
 
I also am in the camp that believes that it was used to reduce or eliminate harmonics, vibrations, etc. The factory did some stuff like that in other areas as well. My 2007 Ram has some strange weights fixed to the underside that seem to serve no obvious purpose. I deduced that they must have been to quell some vibration.
 
funknut said:
Thanks everyone. I will ditch it for sure. And yes, it’s obnoxiously heavy!
Click to expand...

Wish I was coming to the Mopar Nationals in Ohio. I would let you ditch it in the back of my truck. :):)
 
Officer Higgins said:
Friend had 68 charger replaced the original driveshaft that had the enertia ring with one that did not. He always had a rump rump rump rotating sound at highway speeds. My 67 has original drive ahaft with that ring also no odd sounds
Like he had. Not sure if that was his problem but it was something he changed.
Click to expand...

I'm pretty sure its there to reduce noises the driveshaft makes whilst spinning. There's more than you'd ever want to know about it on Google Patents;

https://patents.google.com/patent/US20070026955
 
For 71-3 B's they mounted this heavy weight in the tunnel above the driveshaft but only on non-hp cars. HP cars had nothing. In 74 they started using a weight on the tranny tailshaft.

20190805_085442.jpg 20190805_085501.jpg
 
Same as was on my '67 Coronet 318/727/8-3/4" car too.
 
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