help with a noise from the back of the car.

Guys i just got the car yesterday and it seemed fine but today I am freaking out thinking I got burned or something. Please help me.:pale:

I am getting a noise coming from the back of the car when i drive it. I suspect it to be in the rear end or drive train somewhere. After slowing to make a turn, the car has a loud rhythmic thump back there and kind of rolls funny in the first gear and early into the second gear before smoothing out.


What should i be on the lookout for? what would cause that and how is it corrected?

sorry I forgot to tell you about the car. duh!
1976 Dart Swinger Special
AT
360 4bbl

Not sure what else you may need.


Thanks in advance for any help.

Moderators feel free to move this if I am in the wrong forum. thanks