Driveshaft with massive flange at yoke/trans end?

[funknut]

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.

 

[Kern Dog]

What kind of car, truck, van, motorhome, SUV or Quad is that from?

 

[5.7 hemi]

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.

 

[R/T Boy 67]

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.

 

[funknut]

What kind of car, truck, van, motorhome, SUV or Quad is that from?

It was on my 68 Charger. Original 383/727 car. No idea if this is the original driveshaft, though.

 

[funknut]

Thanks everyone. I will ditch it for sure. And yes, it’s obnoxiously heavy!

 

[Jerry Hall]

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.

 

[Dodge33]

It was on my 68 Charger. Original 383/727 car. No idea if this is the original driveshaft, though.

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.

 

[moparmarks]

Yep Harmonic dampener.

 

[1967coronet]

Same ring on my 67 drive shaft.

 

[Officer Higgins]

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.

 

[kiwigtx]

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.

 

[mopar 3 B]

Chrysler went to a tail shaft weight. I should have kept it instead of throwing it away.

 

[Kern Dog]

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.

 

[69Bee]

 

[Jerry Hall]

Thanks everyone. I will ditch it for sure. And yes, it’s obnoxiously heavy!

Wish I was coming to the Mopar Nationals in Ohio. I would let you ditch it in the back of my truck.

 

[62MAX]

It's there for a reason !!

 

[Lefty71]

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'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

 

[moparmarks]

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.

 

[451Mopar]

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