2002 Ford Expedition

2002 Ford Expedition
I was recently in a wreck and now at about 30 miles per hour my truck will dangerously jerk to the right and it will not make a sharp left turn. I was told the steering gear box might be leaking. I did not have these problems before the wreck. My tie rod ends and all have been checked seemed to be OK. Would replacing the gear box be the thing to do at this point.