Hello all!

I am the new proud owner of a red 1994 Ford Mustang V6! It's an automatic, and it does have a lot of miles on it. I have a question. Sometimes when my car gets to around 40 mph, my car rattles really bad. Does anyone have any idea why my car would be doing that? How can I get it to stop?

Thank you!

 

U-joints possibly, wheels out of balance.