Inner Tie-rod ends (where it attaches to the steering rack) . They are simply ball-joints in the steering rack. If people drive their stangs over heavily bumpy roads or they nail speed bumps like they weren't there, then the inner tie-rod joints will wear out FAST. I had exactly this from nailing speed bumps too fast at work lol. Front end eventually started making banging noises, especially when hitting bumps. It was the inner tie-rod on the right side. The wheel easily turned in and out by a quarter inch.. And this can really wear out the tire/s on the side that is bad. Another thing you may want to inspect... the front brake calipers. Make sure they are bolted in TIGHT to spec. Otherwise the bolts can slowly start backing out from bumps and heavy braking, and then the calipers start clanking around from being loose.
Damaged strut (could be old, cylinder could have blown or it is damaged and/or bent) . Ball joints... maybe . Usually the ball joints will slowly start making creaking noises before they bang around from bumps. How many miles on this car?