what's this for on the 73

[mopar73]

There is a u shaped heavy weight in the driveshaft tunnel between the seats and I was wondering what it is for.  My guess is in case of a broken u-joint to keep the drive shaft from smashing up in the tunnel or possibly some wierd form of vibration control. Anybody else got one better.

[klutch]

I've heard it's a transmission counterbalance, they sure are heavy enough. lol

[RD]

Yes it is a counterbalance to assist in removing any vibrations caused from the driveshaft

[1972Rallye]

It's a vibration damper...  This thread covers it well:

http://www.dodgecharger.com/forum/index.php/topic,67403.0.html

[ACUDANUT]

 Yep. 

[mopar73]

It's a vibration damper...  This thread covers it well:

http://www.dodgecharger.com/forum/index.php/topic,67403.0.html

Thanks for the input.  Somehow I missed the thread that you posted for me .  It's kind of funny that two people were wondering the same thing at almost the same time.  This car was originally a 318/auto also.

[John_Kunkel]

Notice that there are two different weights being discussed, one is mounted to the body and the other is mounted on the rear of the transmission tailhousing.

The damper weight on the tailhousing was introduced on the '72  Imperial to eliminate vibrations caused by "resonant frequencies". The body-mounted weights were for different vibrations from many sources.

[Nacho-RT74]

I NEED the weight on to the tailshaft

[TUFCAT]

Back in the day it was commonly called "B-Body Boom" by the Chrysler engineers.