I looked under my 97 Town Car today to see how easy it would be for me to just do a muffler swap and saw that the bottom of my differential was all wet, so I guess there is a slow leak because there doesn't seem to be a bad enough leak to form a drop because my drive way is clean. What do I do. Should I try to tighten up the bolts all around the bottom half where it appears to be leaking or what? Any input would be greatly appreciated.