The judge did not "rule in your favor" they issued you a default judgment against Wachovia. A true "win" would have been where both sides had a chance to state their case, and the judge would then decide which side should prevail. Had it been a true "ruling", Wachovia could not come back and say that they want it re-heard(unless they did that during the appeal period). If Wachovia can show that they either were not served properly, or were not given enough time they have the right to do request this. Just like you would if the "shoe is on the other foot".
Without going into all of the merrits of what case you think you have. There are a couple of things you need to think about.
I hope you have reviewed the Reposession laws in your state. As in several states there is no requirement to give notice before a Reposession. But they usually must provide you notice within a set amount of days after the Reposession.
IF your only claim is that they say you were not on the loan, I am not sure that is enough to prevail. However, for argument's sake let's say you were on the loan. You needed a Co-Signer because of one or more of the following a lack of credit history, negative items in your past history, or a lack of income. Your dad then became a guarantee that if you didn't pay it, he would. Once he died, the bank lost this leverage. As a result they most likely have the right to re-evaluate the loan. If during this re-evaluation they feel that you are still a credit risk they would probably have the right to reposess the vehicle.
As for your personal property. This is where there might be some missing information. Because you say it was reposessed on the 4th, yet it appears that the first time you called the tow yard was 18 days later. To claim any damages on this you may have to give the judge a valid reason why you waited that long before you even started to try and get your items back.
So if the case is re-heard I hope you come back and state the results.