Chapter 7 Bankruptcy question?

My husband and I filed a chapter 7 Bankruptcy and had our 341 meeting yesterday. We live in Pennsylvania. As part of the chapter 7, we were planning on reaffirming our mortgage and 1 vehicle loan. Currently we are about 4 months behind on the auto loan. Today, the vehicle was repossessed. It is coming back tomorrow as the finance company went against the rules by not releasing it on the docket or notifying us of the repossession. Our issue is, we are now thinking of including the vehicle in the bankruptcy after all since we are already under water with it, and we have not yet signed a reaffirm notice. My question is, can we get a car loan during an open chapter 7, how should we go about doing so, and is there anything we need to do? I don't want to jeopardize the bankruptcy while it is open. Help!!!