help with a noise from the back of the car.

The rear end is identified on the fender tag not the VIN. The VIN tells the original engine size. With these cars being nearly 40 years old there is no telling what might have been changed over the years. If it is a Mopar rear end and you have 9 bolts on the rear end cover than it is a 7 1/4, 10 bolts would be an 8 1/4 and no bolts would mean it has been upgraded to an 8 3/4.

Very helpful! Thanks so much.

Well I got back home last nite and jacked it up.
The transmission did not feel loose, nor the drive shaft or U joints.
I knew the rear brakes were redone and in need of adjustment so we did the back up and pump method.

Thinking they could cause the symptom.

Afterward, we drove around the block taking it very easy...... Nothing
So we drove around the development at noral pace....... nothing
Finally, we took it out for a small drive making sure to gow all the way up to 60mph and back down...... nothing

Btw, nothing in reverse either.

I couldn't recreate my trouble....
Did the adjusting the brake fix the problem?