A727 Tailshaft dampener

[Hemidog]

My BB 727 Transmission is from 1976, and has a (harmonic?) dampener attached to the end of the tailshaft. I can not find a lot of information regarding this thing online.
I do not see it on other Chargers, so I guess it is a later thing / longer wheelbase ?

Is it necessary on a 2nd gen B-body?
Pros/Cons?

I have a slight howling noise when lightly accelerating above 50mph, but I think it is the rearend.

[flyinlow]

My 1973 Charger had one originally on its 904 transmission. Later I installed a 727 without one and did not notice any problems. I have had a '68,'69 and currently have '70 with 727 transmissions. None of them had the damper.

I an guessing when Chrysler introduced the Torsion Quiet Ride about 1973 those things got added along with the rubber isolated k frame and isolated rear springs.  

The wheel base on the 3rd. gens is a couple inches shorter than the 2nd gen. 

[John_Kunkel]

It was introduced on the '72 Imperial. This is what Mopar says about it:

"On some "C" Body cars, noise and vibrations occur on acceleration at 40 mph caused by resonate frequencies. Correction of this condition is part of a new "Super Quiet" package for Imperial."

[Hemidog]

Thanks for the response. I will take it off and see if I notice anything.

[Nacho-RT74]

I have seen 73 and lates Chargers with them. And one even bigger

[armor64]

I always wondered if the tail-stock would flex or resonate on the long 727 bodies. Is that why my 68 driveshaft has a weight ring on the front yoke? was this  bolt on weight their way of getting the mass off the rotation?
interesting either way!

[flyinlow]

It was introduced on the '72 Imperial. This is what Mopar says about it:

"On some "C" Body cars, noise and vibrations occur on acceleration at 40 mph caused by resonate frequencies. Correction of this condition is part of a new "Super Quiet" package for Imperial."

Was that the reason some of those cars had double u joints on the drive shaft?

[John_Kunkel]

I think the double joint is more about angularity than harmonics.

[Alaskan_TA]

Here is a page that shows one version in use on some 1972 B-bodies;

https://www.hamtramck-historical.com/images/serviceHighlights/1972/1972%20sh%20p93.jpg

[Alaskan_TA]

1971 B body - https://www.hamtramck-historical.com/images/TSBs/1971/D71-23-11%20Page%201.jpg