Calvary Investment LLC and their attorney filed a judgement against me on a auto loan taken on a bankrupt,final 10/30/2003, Is this legal and valid

It certainly doesn't sound right. If you had a lawyer handle the bankruptcy, you should see him or her about this right away. If you did the bankruptcy yourself, it might be time to get some professional help, and one place you can find an attorney is http://attorneypages.com

When you say, "filed a judgment," what isn't clear is if they filed a lawsuit which somehow you never found out about, or didn't bother to answer, which has resulted in a judgment, or if they have filed a lawsuit, but haven't yet gotten the actual judgment, which is the decision at the end.  It does make a difference!

You'll need all the paperwork from your bankruptcy, and whatever you know about this new case, when you talk to your lawyer.  There are a lot of details that can make a difference here.